I know one such plastic.
Never been interested in football. Lives in Manchester but raised in Essex/South East.
Suddenly has a City Shirt and goes to games (because you can turn up on the day and walk in)
Made a comment on facebook about United once, I commented, they said "you wouldn't understand"
I actually forget the comments, but my comment was a direct piss take out of their glory hunting BS at suddenly being a football fan at 47. I just said "only one of us understands this conversation and it's not you"