Why are so many Christians hung up on ity?

In answer to your last question, it's not. Sin is sin. And in answer to your first question, Christians are not 'hung up' on uality, we simply answer your questions when you ask. Our doctrine teaches against the lifestyle, just as it teaches against lying, gossip, stealing, etc.. If you can't agree with the teachings of the Christian faith, so be it, but at least agree to disagree. Why must we fight?