[brailsafe]

I think it's a mistake to conflate passive signaling with asserting oneself, and whether you like the interaction you might have otherwise had or not (as long as it's not clearly harassment or something) it would be rude to ignore people in public whether that rudeness is delegated to technology or not. It's just another way of turning up one's nose, and it's a gross way to operate imo. If you don't like the people you'd interact with, it seems to me like it should be a personal goal to find a place to work or live that's more palatable from that perspective. If you go about life preferring to pre-emptively refuse interaction with people passively, I'm not aware of a better word than "rude".