What in the world is in that pipe you're smoking, friend? Some of that Mexican rope, maybe? If you can extract from anything I've said about the desirability of changing your mind when new facts present themselves that somehow means there is no right or imperative for self protection something has gone very wrong in the way logic works in your brain. The only possible way it could be construed that way is the following:
1) I like A.
2) A is good.
3) He likes B.
4) I don't like B.
5) B is bad.
6) He likes bad things.
7) He can't like anything good.
8) Ergo, he doesn't like A.
It's a convoluted version of "I'm everything that's good. He isn't just like me. He must be bad." and brother to "You play with him. I don't like him. So I don't like you." Hubris, shirk, incomplete socialization. Choose your poison, just five cents a glass.
I maintain that that isn't the logic of adults and inquirers after the truth. It is the logic of fanatics, the pathologically narcissistic and those with only a passing connection to reality.