OK, I can see your point, that it's difficult to agree upon where to "draw the line", since a nickname might work. Although usually nicknames are something people close to a character would know, but not available for the public to see. To hear, yes - "did you know that Sergeant Gavon Benda goes by the name "Stickybomber"?? He's insane with all his cryobans. Goes on a grenade spree on the field!" - maybe something like that.
But yes, I hear you. I would ofc. "accept" someone called Flash if that was his thing.
I don't want to be an annoying-*****-RP-judge, but there's just generally a lack of seriousness when it comes to RP servers, which I hope people can change.
Besides, when there's so few RP servers, wouldn't it be more fair to roll on a normal server, if you're not gonna RP at all? Just out of respect for people wanting to do so. Or for the people joining RP servers to avoid the occasional Lazerbeam DarthFamilyGuy. There's alot of those people.
I'd find the character name Sarah-Palin offensive, if played on an RP server.