I'm not so sure he didn't decide he wanted coffee in the middle of the Tweet and, since he can't stop saying anything that comes into his head, he typed it, but since he's also an idiot, he didn't spell it properly.
I've played Scrabble for decades and I didn't even know there were any slurs allowed. Never in any game I have ever played do I remember a slur. Not even when playing against a computer. That's how "woke" they've made this new version!