It's amazing just how informative ONE tweet can be. And, BOY, has the internet lapped it up. 
By way of a bit of backstory; Dustin Lance Black is engaged to Olympian Tom Daley. And that's about all the backstory you need to put this tweet in context.

Obviously, Twitter is tickled silly this morning, with reaction including...

And poor Sam thought he was only going to have to deal with flack from Gaga's Little Monsters (his Bond ballad Writing's on The Wall won Best Original Song over her very powerful Til It Happens To You), and being referred to as George Michael by host Chris Rock...

Update: This is how Sam Smith reacted to being told her wasn't in fact the first openly gay winner of an Academy Award. He's just doing everything to win the world over isn't he?