Laugh to yourself, and continue with your daily depravity. Or whatever normal people do during the day. I can't really admit to knowing much about either, I'm really more of a night person... but I digress, the important thing is no one actually uses that sort of language unless they're:
1. Under the age of 12, and don't even know what sex is.
2. Not capable of coming up with a better insult (on a Sonic video comment none the less! I mean, "furry" would be a good start, but I'm sure better ones exist, like, say, "dog botherer")
3. How to put this nicely... "Special".
4. Trollin'.
5. All of the above.
Personally, I've given up replying to people who post comments on youtube just to disagree with people. I'm not going to get anything out of it, so why bother?