Believe people (individuals, groups) when they tell you who they are.
Meanwhile there are two separate Nazi references in the SSIDs of my friend's building. This is, frankly, an idiotic line of discussion. I mean, smearing Chinese students (oh I forgot, you said "not generalizing" as though that means anything at all [yes, you were generalizing otherwise what is the relevance?]) because you saw some SSIDs, really!
I think those NAZI SSIDs are indicative of your friend's neighbors as well.
You are bad at reasoning. The SSIDs are indicative of those specific people but not their larger group, in whose membership you can't even verify; there's no way OP knows the SSIDs even belong to Chinese grad students! And even if they did, it tells us little about Chinese people in general.