Making fun of others for fun?

Okay so i was on twitter and i saw a tweet. That person made fun of others because they have acne. I mean come on, seriously dude? H/she was like "Shut up, pizza face". That's just plain ass rude. There's a lot of people that love to make fun of others based on their physical appearance. It does not reduce their "utility", by belittling them. Even me, oh dear god, im sorry if i ever offended anyone, I have no intentions of making you pissed. Peace. 

Anyways, it's just wrong. They don't even asked to be that way. You might just end up hurting their feelings by disrespecting them. Some people however, tend to play it cool as if they don't even care people are making fun of them. Well, every negative action is only "bad" due to people's reactions to them. But in many cases, there is little reason to be upset when people make fun of you. Right? When they make fun of you, they feel happy over some weakness of yours. But is that necessarily a bad thing? It can be bad when they make fun of you in front of others and proceed to spread degrading information about you, causing other people to lose respect for you. But they could spread that information even when they're not making fun of you. So straight to the point, MAKING FUN OF OTHER PEOPLE ARE NOT COOL! -LA