is he your superior? that is the only thing that would require you to talk to your manager. depending on the firm culture and your ego i'd consider this: you are the new one. there are minds to make up abput you. if you go and tell them about the situation, your are the one ratting others out and playing right into his hands (by ratting him out you show yourself not being a team player and - depending on management views - maybe even high maintenance). if he talks about you, he is probably already known to make quick assumptions and not shut up about those. by not telling on him, on the other hand, you show that you provide value independent of others and are not easily influenced.
try to talk to the others (carefully) why he acts that way and how they deal with it. it is normal to ask questions. you are the new joiner and just want to get to know the firm culture.
sorry for typos (typed on phone)
what is that supposed to mean? when the api charges were announced, multiple subs went private and were resurrected against the mods' free will. other mods were instituted. whether any of those made any money, i don't know. keep in mind that i was not one of those mods and thus cannot verify that information, it is just what was posted on reddit multiple times. trying to deescalate and moderate a sub is a good thing and we should be grateful to those who actively do, but holding it against them that they do not take any money for that neither makes sense nor does anyone benefit from it.