Personally I don't see anything under the LGBTQ umbrella as something you agree or disagree with. All of these types of people exist. As King Phoenix said, you can't agree or disagree with the way something inherently is. Homosexuality is a condition of being, not a behavior like smoking or drinking. You would say "I'm going to smoke." You wouldn't say "I'm going to homosexual." It's not the same thing.
Race is actually a good example. It is something you inherently are and cannot change. Sexuality and gender are the same way, so you should think of them in the same way.
The primary issue is ignorance. A lot of people genuinely do not understand the idea of not being cisgender or heterosexual. It is completely contrary to their experience and it is tough to imagine feeling differently. We as a community need to be more open about our feelings and lived experiences. The more people know, the more their minds change. It's not about pushing acceptance, it's about pushing knowledge. Knowledge breeds acceptance.
And I mean no offense when I say this, but you realize that people who "disagree" with trans people would call you a lesbian for dating a female, right?