Ok... let's answer this in order.

1.

No matter what their beliefs are

: First they are acting on those beliefs and changing society to discriminate for women and against men. Also, their beliefs on gender issues are demonstrably false (or at the very least highly questionable) and extremely sexist (misandric), so could it be called evil to change society in accordance to these beliefs? If so, opposing them is a good thing, is it not? Some feminists out there want to eradicate the male gender completely, so I'd call hating them a pretty sane response to their hatred, discrimination and aggressions (verbal or physical) from any man who does not fancy being extermined.

2.

isn't it dangerous to hate feminists and how can you pick one out in a crowd anyway? This guy thought he could: http://en.wikipedia.org/wiki/Marc_L%C3%A9pine

: First, yes, it can be hard to pick a quiet feminist out of a crowd, but thankfully a lot of them are not so quiet about their ideology and their hate-speech against men. These are quite easy to pick out and oppose (which serves to oppose feminism as a whole without having to go out and find the quiet ones). Also, Marc Lépine was highly delusional and does not represent the rest of those who oppose feminism anymore than Herbert Mullin represents the rest of those who don't want destructive earthquakes. By the way, Marc Lépine did not believe the women he shot to be feminists in the way we use these words (fighting for women's "rights" and their crazy concept of equality)...he saw them as feminists because they were studying in a traditionnaly male field (and because he believed he was not accepted in that very field because women took his spot).

3.

Aren't women entitled to equality in the 21st century? We aren't biblical stock animals anymore, you know!

: First, I agree about equality, that's what I desire too. Now, with equality in mind, go read some popular feminist litterature, or better yet, read the feminist quotes collected here on antimisandry (they get right to the point). After this reading, I doubt you'll still be able to believe they want real equality, unless my concept of equality is all wrong in the first place, or you suffer from some delusions/brain-washing. I'd go so far as to say feminism as a movement suffers from acute paranoid delusions about persecution from men, and they will do anything to stop this imaginary persecution... trouble is that there is no systemic persecution to fight, so all they do is rig the system more and more against men, and thus feminism should be stopped for equality's sake. Also, for the bible thing, I can agree with that too, but fighting feminism is not limited to a religious thing or a biblical interpretation, although religion certainly plays a part in many MRAs' decisions.

Now, I think that sums up what I had to say on the matter. I hope this answers the question.

I'm too lazy to write what I think of the Mark Lepine douchebag. But despising a hateful ideology like feminism is actually good, not bad.

Yeah, the person who asked that question is mentally challenged.