well this is a really complex subject to talk about in my opinion. Depending on the case this can get more serious or more frivolous.
For example, if someone is just making fun of someone he never saw before and they dont meet often, and the "bully" (not really, im just using the term) is saying stuff like: "you stink" or "your head sucks lol", and the other guy is just the "no u" type or even if he is just quiet, I dont see any reasons to banning or punishing him although I find it really disappointing to see.
On the other hand, there are cases where the "bully" dude keeps following/stalking a specific person to make fun of it, and most likely to get them mad. No matter how upset the person might seem or how much they ask the "bully" to stop, he wont let go. That's a completely different case and totally should be punished

After all and summing up, isn't exactly about the "making fun" attitude, but instead whether it offends the target's pride/honor or anything alike, you can interpret that as disrespect too if you will. Something that im pretty sure is included in the community's general rules is that you should always respect the others, and that's something that should be applied to real life too so