It's not an orientation.
What kind of boundaries? I personally find "pride parades" disgusting myself, you can water cannon that shit. And there's about a 1000-to-1 chance I'd ever want anything to do with a straight person sexually. It's also a matter of ethics - doesn't twitch, not even a little bit.
I support their right to hormone therapy and gender reassignment surgery as adults. I support anti-discrimination protections for them on matters of employment, housing, public education, federal funding, credit, and the jury system. I can't get on board with re-defining sex in the federal code to include a person's sense of "gender identity" or unfettered 'public accomodations' access, at least not when they're pre-op.
You refer to "barriers" sarcastically as if same-sex activity between consenting adults wasn't legalized nationwide in the 21st century. 'LGB people' have been building and contributing to civilization and culture for -at least- over 2,500+ years. "LGB rights" are nothing more than run-of-the-mill civil rights and don't come remotely close to bringing the societal baggage that gender identity does.
I simply do not like being conflated with and indirectly beat over the head because of these people. Nor does any other G/B friend, acquaintance or associate I have or know.