My partner and I have been together for over 4 years. People know we are a gay couple but some people keep trying to set us up with females. We try to handle it politely, but it's getting to the point that we are ready to go off on some of these people. It's called RESPECT.
There are still people around who have difficulty with the concept of same sex couples. Maybe out of ignorance or resistance. Just keep your mantra – "Thank you, but I'm already in a committed relationship." Getting angry won't help you.