No they shouldn't be added unless the character himself actually used it as an alias
Well it seems fesak was responding to the original question as to know if insulting nicknames count as aliases. I am only responding to the comment you made about internet screen names. And well there nothing in his last post that would say otherwise, I think we can all agree that when someone use an internet alias he use it himself?
Whats to stop users from adding internet screen names as aliases then? There have been a lot of characters that have "chatted" online in the comics using screen names like we all use, those don't have a legitimate place, off the top of my head I remember Iron Man, Robin, Nightwing, Black Canary & Batman using screen names and I'm sure there are a lot more.