1. Because Disco was dance music. People don't dance no mo', all they do is this. All they do is this. All they do is this.
2. Like other dude said in here, Disco was a fad. It came and went. As with all things that come and go, it is embarrassing if you was down with it. For example, I know some of y'all niccas got a fanny pack somewhere. And POGs.
(note to self: name next mixtape "Pogs to PAWGs".)
3. Like another dude said in here, it became closely associated with gays.
I mean come on - this song SLAP, but Sylvester was a straight-up 'mo (don't ask me how).