Real Madrid - obviously an team easy to dislike, but I think I'd want them to lose to any other team on the planet. Horrible club, horrible players (some like Modric get a pass) and a horrible fan base.
Birmingham - just find the whole Peaky Blinders culture embarrassing. Bet their owners would love to eventually change their name to Birmingham Peaky Blinders
Walsall - still remember the games in league two where their fans were trying to build some kind of rivalry with us.
MK Dons - one of the worst away days I've been to atmosphere wise, and even their own fans couldn't be bothered to support them.
Arsenal - don't mind the squad itself, but cannot stand their whiny, fickle, entitled fan base.
Manchester United - easy to hate, but I've loved witnessing their recent downfall. All their plastic fans popping up on our social medias when we initially drew them was also unbearable
Special extra mentions to Leicester, Chelsea, Wrexham (only recently) and Stoke. Don't actually mind Villa