If, by liberal, you mean one who is open-minded, accepting of others, and engages in rational, skeptical thought, then brand me a f***ing liberal.
Those who believe homosexuality is a mental disorder are the ones who are, in fact, brainwashed. That type of belief comes, typically, from religious indoctrination, or lack of education and rational thought. By saying that it's a mental disorder regardless of how one looks at it only goes to show how narrow-minded you are. All you're doing is displaying your rigid unwillingness to allow rational arguments to sway your irrational beliefs. And while you're perfectly entitled to your opinion, know that your opinion can be, and is, wrong.
Autism is detrimental to those affected by it, and pedophiles harm children. Consenting adult homosexuals harm literally no one. You can say you don't approve of it, or you're disgusted by it, but what consenting adults do in their bedrooms is of no concern to you.
What's almost as disturbing as your opinion is that you seem to revel in it. What's incredibly disheartening about this world is that many of us have the ability, and opportunity, to make ourselves better, more inclusive people, yet we have backwards-thinking people like you, working to maintain archaic beliefs, and spread hatred and loathing. I truly pity your existence.