I don't give a shit about someones sexuality. Who, what, where or how they get it on is something that I never need to know about. Behind closed doors and the privacy of their own experience is where they should be kept, those things should not be discussed outside of that place. I should never know if a couple is gay, or straight or whatever. People should be considered 'partners', and that's that. Things will explain themselves naturally, we don't need to go out of our way, or rather shouldn't have to go out of our way to express it.
I'd rather congratulate her on her success, not her sexual preference.
Also: Sexual preference shouldn't be treated as and isn't a disability, we should stop treating it like one.