I gave my honest opinion about the video and suggested how to make it more interesting, from my point of view. Opinions can be positive or negative. I don't know if any opinion that differs from "gret video madman" is a bad attitude for you.
You didn't even say why you disagreed with my post. You joined the conversation exclusively for the sake of insult. It was a personal attack, in a forum that is intended for discussion and exchange of ideas. Is that a "bad attitude"?
Anyways, I'm not offended at all. It doesn't make a difference if you believe I'm stupid or not, it's an irrelevant opinion from a stranger. It damages your reputation more than mine if you act like a hooligan. And it affects the quality of forum discussions and their interest for the rest of community. But no, it doesn't affect me.