The advice “think for yourself” is good wisdom. But most people that fail to heed it aren’t, in my experience, letting other people think for them. They’re letting other people think against them, and letting that dictate all their opinions.
Sometimes, you won’t like someone. And sometimes, I am very very very sorry to tell you, that person will be correct about something. If the person you hate most in the world says the sky is blue or two plus two equals four, your revulsion doesn’t change the facts.
So please, please don’t just automatically assume that every opinion you hear from someone you don’t like is false. The world is a series of spectrums, not two big buckets. “Them” is everyone. If you must be contradictory, make your contradictions against your own errors. Think against yourself.