I'm of two minds about this, because of the generality of this blanket statement. Why should we accept this as the norm? I would classify these people ("enjoy calling people names") as abusive, and think that classifying this behaviour as neurotypical effectively legitimizes it.
That said, nicknames are also an expression of affection and inclusivity, and derogatory nicknames are not necessarily meant as an insult. Still, they're just as easily used to demean, belittle or dehumanize the target, so it depends a lot on context. I understand what you mean, but I disagree with your general statement.
By the way in the middle school we used a derogatory for gay every day without even having any idea of what did it mean, all we knew was that was the worst word we knew. When others bullied me (always (or I just never cared and don't remember the verbal) physically, way harder to endure) I occasionally went mad and called them this word repeatedly.
https://www.oed.com/viewdictionaryentry/Entry/67623#eid46436...
Not sure how you win exactly, but others in a similar position but sensitive to name calling certainly don't.
As for name calling and slurs at work, I don't see a reason why these should ever be tolerated. Someone who cannot demonstrate a minimum of politeness towards their colleagues shouldn't be part of the team. To me this is a no-brainer.
Usernames are a bit different IMHO. In a general social network, offensive usernames give important clues that allow you to avoid all contact and block users before you even talk to them. So maybe banning them does more of a disservice than a service to other users.
The problem is when language changes for some but not all, so suddenly words that used to be perfectly normal are considered slurs: Those who learned and use them in the original non-offensive sense are suddenly, and in their own opinion unjustly, seen as bigoted.
You may be wrong, and these "High EQ individuals" right, in the sense that your acquiescence to this bullying behaviour might encourage the bullies to keep it up with others too. In that sense, your standing up against them would be not just for yourself but for all their potential future victims too, which would increase the future sum total of happiness in the world.
(I'm not saying it is necessarily so, but it may be.)
As the sibling comment eluded to, you definitely seem to be the "High EQ individual" in this story!
Even when the insults could be considered objectively offensive I'm still generally okay with it. I've been called names quite a bit in the workplace over the years and I'm okay with it if makes them happy. Being autistic I don't really care and neurotypical people seem to get enjoyment calling people names so it's win-win.
High EQ individuals have told me this is wrong and the appropriate reaction would be to take offence and try to make them feel bad, but I've argued this would just result in an objective reduction in happiness in the world so it wouldn't make sense. Plus, most of the time my colleagues have been nice to my face so it's not like it's ever got in the way of me doing my job.