So, are there? I’ve heard stereotypes about almost all regions and races (Burkina Faso possibly excepted.)
But curiously, none about the Welsh. For some reason, the only one I can possible think of is “they’re all woodsmen with big bushy beards: think in-shape Unix gurus.” I have no idea where that came from or even if it’s widespread.
So, in the spirit of greater international intolerance 
feel free to clue me in!
I’ve heard that Welsh men REALLY like sex, and that they’re good at it, too. Or at least very enthusastic about it.
Hell yeah: small dark haired people who play all rugby, sing in choirs, herd sheep or mine coal and speak a strange language. They are all labour voting methodists. If you read Kimgsley Amis’ memoirs there are other stereotypes such as cheating people while smiling at them.
Actually I think a lot of what people (not Amis) say about Welsh people, especially on TV, comes pretty close to racism. Scots and Irish people are used to offensive jokes, but those told about Wales, and the apparent acceptability thereof, are of a different order (sorry I haven’t any examples just now).
The offensive Welsh stereotypes generally involve an affinity for sheep, incomprehensibly saliva-soaked placenames and a chip on the shoulder about the English. Of course, these stereotypes are generally heard in jokes told by the English, so you can make of that what you will.
G Odoreida has explained the less offensive version to a tee.
The only Welsh stereotype I’ve ever heard is that they’re very bland eaters. For example, my wife (who happens to be Welsh, in the same sense that I’m Irish…) is a very picky eater, and the first time we had Thanksgiving together, she just had a couple slices of breast meat, some mashed potatoes, and stuffing. One of my uncles commented that “That’s a Welsh plate if I ever saw it,” not knowing she was Welsh.
Other than that, I don’t think I’ve ever heard one, either. Can we make some up if the thread goes nowhere?
Why, yes, that stereotype’s entirely true. 
In the vein of “Taffy was a Welshman/Taffy was a thief/Taffy came to my house/And stole a leg of beef”?
Don’t forget the leeks and names with “yll” in them.
I have a “personal stereotype” about Welsh people. I have no idea if this is a general stereotype, but it’s definitely the first thing that I think of when it comes to to the Welsh:
They reeeeally don’t like being mistaken for English.
I had several classes with exchange students from Wales. They made sure to let you know that they were Welsh, not English, and if someone mistakenly referred to them as English, they got really indignant. They barely tolerated being called “British.” They would, if pressed, admit that they were from the United Kingdom, but not Great Britain. And if someone complimented them on their “English accents,” they got chewed out–in a Welsh accent, of course.
I have no idea whether this is a common trait among the Welsh, but I’ve since been extremely careful to never call someone “English” unless I confirmed that they actually were from England itself.
I’ve always been told that people from Wales (especially the men) are inveterate whiners (or, in the colloquial: they whinge a lot). Of course, this is said by my Scottish co-workers about my Welsh co-workers, so…
One thing not mentioned so far is the commonly held assumption that we all think we can sing. I don’t happen to believe it myself, -I can’t for one - but there have been occasions at a rugby international where the singing can be special.Unfortunately Welsh rugby has been in decline for some years so there is little to sing about these days.
The other common stereotype has already been mentioned, we are all supposed to have a particular fondness for sheep. I don’t mean eating them either. It’s in the same vein that Gene Wilder explored in “Everything you wanted to know about sex etc. etc.”
As for bland eaters, our curry houses are just as full after the pubs close as anywhere else 
V
I read a whole article about the offensive stereotypes used to portray the Welsh in television and movies.
Just as an example, Hugh Grant’s roommate in that Julia Roberts movie. (Can’t remember the name of that piece of drek at the moment.)
Also, the kicker in The Replacements. Interestingly, it was the same actor in both roles, so it may just be his take on the Welsh.
The article had several more examples, some also from television, but I read it years ago and can’t remember any more of them.
The sterotype is that they are crass, dirty, slovenly, uncouth, and just all-around unpleasant.
Also, the phrase “to welsh on”, in the sense of “to fail to pay up after losing a bet”, or otherwise evade an obligation. However, the origin of this expression is
disputed.
Here is a page listing the typical views held by various ethnic groups (including the Welsh) about each other.
Weakest Link host Anne Robinson has caught flak for resorting to stereotyped comments about the Welsh on
several episodes of her quiz program. Googling on “Welsh stereotypes” will yield plenty of additional links.
One might also mention Welsh Rabbit as a slur on the proverbial poverty of the Welsh:
In other words, the same stereotype as for any ethnic group that is not one’s own.
green bean, that’s true. But of course the Welsh aren’t English, any more than the Scots or Irish are English. It’s a bit like Canadians being annoyed at being mistaken for Americans, or Southerners at being called Yankees. It’s not just incorrect, there’s history behind it.
Singing does seem to be in decline, a great shame.
Maybe I wasn’t clear: These girls treated being mistaken for English as some sort of grave insult. They got really offended. I can see being “annoyed,” but they were far beyond annoyed. They were pissed.
Green Bean… how would you feel if somebody told you they found your Mexican accent sexy?
The only universal stereotype for the Welsh is of a nation of “sheep shaggers”…
In England it is also generally accepted that any Welsh place name will be pretty much unpronounceable (and it’s true).
The only one I’ve ever heard is the unpronounceable name one. Although this
intrigues me.
Look at the music the country produces.
Manic Street Preachers
Catatonia
Stereophonics
Super Furry Animals
Being stuck up a mountain without tv or radio reception, you have to make your own entertainment.
I think we should all spend more time on remote mountains with bad radio reception.
Don’t forget about the Master, Tom Jones.