If you'd come through the Sixties and all that, and Sly and the Family Stone, political soul etc etc .... it kinda makes sense you'd resent disco, especially if you were not aware (as most people weren't) of its roots in the gay underground. Most people first encountered it as this commercial sound that suddenly exploded and was oppressively omnipresent. I think in the States, a really huge number of radio stations switched to the disco format. It wasn't like that in the UK, Radio One had a balanced playlist, so I don't think there was ever as much of an anti-disco feeling - plus there's the longstanding working class attraction to danceable black music from America. Quite a few major rock artists had a go, and New Wavers too.
Obviously some ugly undercurrents to discophobia and the record-burnings are hideous, seem to have awful historical echoes, but... as Luke has noted, anti-disco sentiments cut across racial lines and had all kinds of motivations. Quite possibly there are gay music fans who found it unbearable, repetitive, etc.
Greg Tate the great Black American critic and supporter of Miles in the 70s, Parliament-Funkadelic etc, he once described disco as DISCOINTELPRO - punning on the FBI's infiltration / defusing of Black Panthers and other Sixties radical groups.