I think I know what you're talking about, although I've not seen it with my eyes
You should be not suprised, a big part of Bulgaria is always separated by two sides: blue and red. Levski is the blue part, CSKA is the red. And Berbatov used to wear red, so he is actually hated by a half of the population of Bulgaria
Maybe it sounds bad, but it's true. The bulgarian people don't unite almost never, even when the national team is playing. Even then it's all about Levski and CSKA
But about your question - no, I don't hate him. I think he's a great person, very modest and well-mannered. I expected more of him in Man Utd though, but that's a different story.