I think I do that as well. But it's more to give examples of how people can deviate from the general behaviour of said group, and maybe to prevent people from assuming the generalization is true for all of that group. Never to claim the generelization isn't correct.
It's often in situations like that you hear the "everyone is an individual" speech. Right after you make a blanket statement (and even emphasize that you're describing things in general) people can almost aggressively point out that they know several people who aren't like that, therefore it isn't true. It's like they suddenly have a selective hearing to filter out words like "generally", "most" or "often". Sometimes, it's annoying. Other times, it's infuriating.
I know, and I dislike people who try to be different for the sake of being different. I also hate people who try to be traditional for the sake of being traditional. Just be you. I like tradition, but somethings I do might not be, who cares? because at the end of the day I'm me. and people didn't get that's what I was saying