It all comes down to the fact that there are shitty people in the game. Wether it's overconcerned parents, trolls, or just kids.
I had a hunter named Cumshots. Had the name uptill lvl 60 when i started running dungeons. Changed his name to Bowjob. That needed to change around 75. Probably due to the fact that someone bitched and whined at the Blizzard helpdesk about my name being offensive.
My point is: In the end you meet a dick that takes enjoyment out of your namechange. All you can hope is you never meet that person.