See, I normally support teams with former Celtic players in them, with the opposite going for rangers players. I've explained this before and I think we agree it makes sense.
Similar thing for managers, but more to do with former rangers than Celtic if I'm honest. Not really fussed about the Celtic managers but a club is hateable for having a former rangers man as manager. Particularly if it's Graham Soonest.
Then there's Paul Le Guen, former rangers manager so the rule should be I don't like Paris Saint German. However they treated him like shite and he left in fairly acrimonious circumstances. So I kind of want to see him doing well. Get It Right Up Ye kind of thing.
It's a quandry people and a doozy at that.