…a philosopher is bound to make enemies because of his ideas, or else we can say he isn’t a proper philosopher at all.
I used to work for an organization that promoted the “constructive engagement of science and religion.” The trouble with that mission, though, is that it is milquetoast. It tried to show that everyone on both sides has a point and that all should be taken, if not totally seriously, then at least with a modicum of respect. But who can disagree with a mission that reduces to “don’t be so judgmental”? The problem for that organization was that, as I always used to say, “we didn’t have any interesting enemies.” If you are saying something that absolutely no one would find objectionable, then you are not saying anything of interest at all.
Same goes with philosophy. But there are other reasons a thinker might gain enemies: jealousy, pettiness, stupidity, posing, and so on. Slavoj Žižek attracts both kinds of enemies, the ones who read and understand his work yet do not agree with his ideas and the ones who don’t bother to read his work yet feel compelled to not like him anyway. (Jacques Derrida had plenty of the latter.)
Read this piece concerning Slavoj Žižek and one of his enemies to see what I mean.