OMGosh I LOATHE YouTube comments! They're always laced with profanity anyway. I maintain a (fairly) popular blog re: my husband's chronic illness and I just received my first hateful message last week. First one in nearly two years! In fact, I didn't even moderate the comments because they've always been awesome.
The thing that gets me is that they're typically anonymous hateful comments, too; and they tend to end up personally attacking you.
Sigh. Ignorant.