This used to happen, but I do not know if it still does- in a thread about “what is your favorite TV show” someone will chine in with how they never watch TV. 
Given even the slightest opening, someone will note that Michael Caine has never seen JAWS: THE REVENGE…
In every thread where somebody is trying to solve some problem, and includes several things they have tried, somebody will suggest they do one of the things they have already tried.
The hyperbole example I use for this:
My car won’t go backwards. I’ve tried putting it in reverse, but it still won’t go backwards. Any ideas about what could be wrong?
Have you tried putting it in reverse?
Put it in reverse to go backwards.
You need to be in reverse before it will go backwards.
Yeah, that still happens, but less rarely. I think it’s been taken over by the people who come into threads about cellphones to say they still have a “dumb flip phone”, regardless of context.
I have never noticed this.
Just kidding! I have noticed it, and I don’t understand why people do it. Maybe they think they’re adding a data point, but it always sounds like they’re implying that the phenomenon being discussed isn’t real.
Any thread about allegedly-obsolete products or technology will include these kinds of posts:
OP: Let’s talk about pencils.
Doper: Pencils?!? LOL! Who the hell still uses pencils? Are those still made? I haven’t seen a pencil in 40 years! What’s next, a thread about buggy whips?
Other Doper: I use pencils every day! I just bought a package of 100 precision-made hardwood pencils from Germany. I sharpen them with a Swiss-made electric sharpener that cost $800. Nothing beats the feeling of writing with a perfectly-balanced pencil!
I don’t come here often, but when there is a thread that mentions breastfeeding there always seems to be a “don’t make people feel bad about giving a bottle” and a “the fact remains breast is best” comment.
My favorite nut is the peanut.
Well, actually a peanut is a legume.
If the thread is about a food you don’t like, you will get a ton of responses that say “well, if you cooked it this way…”
On another board about air travel, any time the subject of seat-back video screens comes up, someone always chimes in to tell us about how they don’t watch the in-flight entertainment, and those of us who do are “constantly glued to our screens”.
It always makes me think of this old Onion article.
I think it can be a useful data point when someone makes an effort to identify why their experience is different from the OPs. But so often they don’t, and you’re left with the impression that they’re just unobservant.
… and then someone will follow with the fake quote about how it paid for his house.….
OP: Lobster, mmmm
Witty responder: Lobster is just a vehicle for eating melted butter.
mmm
In any random trivia thread- not just on the Dope, basically anywhere on the internet- someone will post about Monkee Michael Nesmith’s mother inventing liquid paper. I’m pretty sure this is now the main reason anyone under the age of around 40 has heard of him.
Dear God, yes! For twenty years I’ve been wondering about this Rush love. It’s like we’re required some Canadian content to run in the Peoples Republic of Canuckistan.*
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- For this thread.
Any thread about vitamins will include the phrase “expensive pee.”
How many under 40 have heard of liquid paper?
In any thread about the lottery, someone will point out that the lottery is a tax on people who are bad at math.
It might not be well known under that name, but it still does get used in schools, if nowhere near as much as it used to be. Here in the UK, the factoid gets changed to Tip-Ex, the local brand name.
In every thread about homes/home improvement/lawns/landscaping, someone always posts about much they hate Home Owner Associations.
Case in point: