From my own experience, there are gay and lesbian folks who get it. One of the sticking points, I believe, is the sometimes adherence to the binary system by some gays and lesbians. You had to look, act, and behave a certain way forgetting the fact that each one of us is different. Tom of Finland is a good example of this. If you didn 't look the part, you weren't taken seriously. Shoot, Hollywood does this all the time.
In the trans community, there are some who believe that one is not a 'true transsexual' unless one has gender reassignment surgery. Trans people have always been part of the gay liberation movements. Foisting one's own insecurities on others is counterproductive.People need to learn to respect each person 's uniqueness.