Hater

Considered the opposite of a raver, a hater is a person who is: full of hate, very judgmental, negative, sarcastic, depressing, manipulating, quick to finger point at every little thing they find unsatisfactory or not to their liking or perceived standard (judgmental).

The most insulting and offending word to a raver is not "fucker", but "hater".

In 2001, a new word "judger" was created, and is now similarly offensive to ravers.