Hate is very strong word.
You may dislike it, but it's not necessary to hate it. You don't have to agree, but still no reason to hate it. You don't have to follow it.
The problem comes in when it's associated with the followers of that ideology - should you hate them for following such? No. Judging another negatively because you disagree, dislike and don't follow it, is childish really.
Heck, there are plenty of people who follow ideaologies I may not agree with, but they are still lovely people regardless.
So, if it's just the ideology you 'hate' - then I suppose it's okay. If it's the people - it's not so much.