Just ignore that poster. Who knows what their motivation actually was? Who knows their background, education, etc.?
It could be someone doing that on purpose, a troll. It could be someone who was told that and thinks it's the law. It could be someone with some personality disorder and you hit on something that doesn't fit with their world. It's very unknown.
Actually from the first line... Someone called you a name on youtube. It doesn't really matter what for.
I don't think I've paid much attention to youtube comments. It's usually just garbage.
If it was something with a background, I'd check that. Then it would depend on their background really, along with the comment. But if they start with an insult... They're probably not trying to help you. Someone could have insulted them at some point. Maybe they're just venting and you happened to be there.
*Bob wonders about this comment strategy....*