It's what ppl do. I know it is hypocritical, having SA and making fun of other ppl. You feel like you are being judged and then you go and judge others, but that's what ppl do.
When I was at college there were a group of ppl I got on with and all they did was joke about other ppl and I would laugh with them, but it's just harmless fun. It's not like bullying, they weren't out to ruin or humiliate ppl publicly. I try to accept everyone for who they are. You can still have a laugh about them in an inoffensive, laughing with them sort of way.