i go to a mixed skl (im 17 btw) and i dont think its strange for a guy to compliment another guy, but at the same time it really depends on the context cuz most guys ik act like they're 7 and take the mick out of each other, but im from east london and all guys think they're roadmen so i really couldn't say, as it mostly depends on the context and the type of guy they are really
hope this helps