That's common. People often say (for instance about food) that it is "bad" rather than "I don't like it". It's much more approriate (and polite) to say you don't like it since there are people out there who love the food (or thing) in question.
As you wrote yourself, you played badly and your opponent was simply bad mannered about it.
I played <NAME DELETED BY MODERATOR> (1027 today and although I truly played badly, I don't think that it was appropriate to say "you suck".
[It is against site policy to accuse other members by name in the public forum.
Moderator]