My answer: No, there’s nothing inherently rude or antisocial about carrying a firearm openly during day-to-day activities, depending on the context and the intent.
Now, if you’re only doing it to prove what a badass you are, then yeah, it’s stupid and rude and you’re a dumbass. Ditto carrying to a kid’s birthday party, unless the other families there are also gun owners or enthusiasts and are specifically okay with it. (Maybe a shooting event is part of the party? :D)
But there are plenty of people (myself and some of my friends included) who will sometimes carry openly just as a matter of personal comfort. If I’m heading to the range on a warm day, for example, I don’t bother with a jacket. Since I usually wear slacks and a collared shirt, I can’t just cover it with a light untucked shirt, which would look tacky anyway. Often, I’ll stop at the grocery store, or my bank, or a nearby Starbucks on my way back. This is in Seattle and Bellevue, where, to affirm Pork Rind’s response to Johnny L.A., open carry is perfectly legal, no license required.
I’ve never seen any indication that people are scared or intimidated - to the contrary, I’ve had many people come up to me and ask about it. Some just commenting on what a nice gun it is (Kimber Custom II, blued, with rosewood grips), others asking if it’s really legal to carry like that. I’m always happy to explain the law to the latter group, and they usually leave with a smile and a word of thanks, though I have had a couple people tell me they thought open carry was a bad idea.
In large part, I think the response I get is due to the fact that I am in no way a scary-looking dude, and I usually dress nicely and act politely. I’m a nice guy, in other words, who occasionally carries a gun without taking the trouble to conceal it.
A few people in this thread have said that they would shun anybody they saw carrying openly. I understand that that reaction is a response to fear, but I think that’s an unfortunate prejudice to have - you shouldn’t be afraid of someone just because they have a gun. After all, why do you trust cops? If you aren’t fearful around police officers, why would you fear an ordinary citizen carrying a firearm, so long as they were simply going about their business in a normal manner? On the other hand, if a person’s behavior is off-putting or hostile, you should be worried about them whether or not they’re visibly armed. After all, the criminals pretty much universally choose to hide their pieces until they’re about to use them.
The vast majority of people I interact with on the occasions when I’m carrying openly notice my ready smile and my polite greetings long before they notice my gun. If you would be frightened of me just because I don’t feel the need to hide the fact that I’m armed, then I’m sorry - I truly am, and I would love an opportunity to show your impression to be mistaken. But I’m not going to change my behavior simply because of your irrational fear and your prejudice.