Shigaraki has been watching the new arrivals. There's usually an influx around a certain time and he comes here specifically to try to make sure no one washes up that he has to pretend he doesn't care about and didn't care about washing up. That means it's not hard to pick out the bullshitters and the weirdos. Considering he is part of it, and parcel to it, he has nothing but a glance to the side at the approach of one of those bullshitters and weirdos approaches him and instantly admits he is, in fact, at least a weirdo.

"Depends on what you call a human, and it depends on what someone else thinks." Impact on himself isn't a huge deal, he's got so many aces up his sleeve that he may as well be cheating.