I don't like eating crab.
What is wrong with eating Crab? Are you allergic?
I don't like it. I just don't get why others eat it.
If you don't like it, then don't eat it. Nobody can force you to eat what you don't want to.
OK, I'll stop talking about it.
It is ok to let others know you don't like crab so that they do not serve it to you.