It was more when I was a kid really. I really liked Celtic when younger because my family are Irish catholics so it was a bit ingrained, I also always wanted all the English and Scottish teams to win in Europe when I was a kid in the 80s. I wanted Forest to win the cup under Clough, JFC I remember being pleased when Norman Whiteside scored the winner in the 85 cup final against Everton (I was 11)Im not sure when it all changed, probably my later teens.
In terms of internationals. Ive always wanted England to win unless they are playing Ireland, Im not even torn then, I want Ireland to win. Its not just my family heritage alone, its all the arrogance associated with the England team in comparison to the patronising disdain for Ireland when those games come around.
My 16 year old is a huge England fan during major tournaments. I mostly want them to win but must admit, where we have been heading socially and politically since brexit, makes feel somewhat disconcerted with what feels like the inevitable nationalism that will splurge out if Engerland do actually win something.