I think is is a really interesting point, and it's something I spend quite a bit of time thinking about. Why is some attention-seeking behavior generally seen as acceptable, even positive, while other attention-seeking behavior is seen as pathetic or rage-inducing?

Based on my own anecdotal experience, I think part of the anger comes from a sense of discomfort at the dissonance between how one thinks the attention-seeker is being perceived and how one thinks the attention seeker believes they are being perceived.

In the case of someone using a typewriter, the issue isn't simply that one thinks that person looks foolish, it's the dissonance between knowing they look foolish and imagining that they think they look super cool. Dissonance leads to discomfort, discomfort leads to anger.

With other kinds of attention-seeking public behavior -- street performance, for example -- even if one doesn't enjoy it, there's a much closer match between how the performer believes themselves to be perceived and how they are actually perceived (assuming they are competent).

I harbor no ill-will towards hipsters, self-identified or otherwise. But if I imagine someone using a typewriter in Starbucks, it does make me uncomfortable, and by far the biggest part of that is imaging that person thinking they are really funny or really cool.