It's easy.
I formed a bond with the club as a boy, before I became politically and morally conscious. Then (even though it took a while) I broke that connection as an adult because I didn't wanna engage in cognitive dissonance i.e. supporting and wanting the best for a club where I hated the political views.
Basically, I lean left of centre, and this club is as right-wing and racist as it gets. Many horrible thuggisgh fans. I am pretty sure people can put 2 and 2 together based on my posting history. I am not gonna associate myself as a person with that.
And I wasn't gonna just start 'supporting' Pep's Barca or Pe'p's City, with zero connection to Barcelona or Manchester, no family history of supporting those clubs, even though for me they've been the two best teams to watch (club wise) of the last 15 years)