I'm very against the current PC culture in general, and pro-freedom of speech, but I also don't think it really helps to call people "cupcakes" and "snowflakes" like this.
There's a reasonable middle ground that we have right now. Insults or outbursts of anger ("minor aggressions" as the OP calls it) should certainly just be ignored as that's part of being human. On the other hand if someone is going on giant hate-filled rants or spamming racist / sexist / etc. stuff for the entire game, report them to Sturmpanther, they'll rightfully get a ban.
Would you rather I called him a teacher's pet? Because I was like him once, a long time ago. I was told that violence doesn't resolve anything, and I learned the hard way that that wasn't so when the teachers didn't really care and that I was treated as an outsider by the others when they learned about it. So I was forced to use my fists, when I got in trouble because of that I was advised to talk it out instead, when that failed as well it became pretty obvious that it was a no-win situation whatever I did, if I ignored them I was seen as weak as well.
So in the end it's best if you just use a combination of these to stay out of trouble in real life, here on the internet it's best to just ignore them since they can't hurt you physically, being "offended" by something is in turn being considered the weakest thing here instead. Going into a fight over it will just land you in trouble as well and won't resolve anything either.
So yes, people are retards no matter what, so it's better to just ignore them rather than indulging in the same acts or trying to ban them, you never know when you might meet that same person again only for them to cast their vengeance on you over some stupid shit somewhere else.
And just for the record, this is all coming from experience, I'm not making up anything here.