I don't like straight people. Am I okay to think this?
What happened to make you dislike straight people?
I'm not trying to be mean, but over an extended period over time I notice I dislike straight people more and more
While straight people don't experience discrimination in the same way, you still shouldn't discriminate in some way by not liking them. They are all different and shouldn't be judge by who they are attracted to.
I'm not trying to make them feel bad, I'm just being honest.
You are making a blanket assumption.  You should get to know others who dont act like that and base your impression of straight people on them.