This is the primary reason somebody selects an odd team to cheer for.
One of my best friends is a Bruins fan but has been since he was a kid, and his dad was too, and they come from a Ukrainian Community that raised some ex Bruins like Johnny Bucyk so it just makes a lot of sense for them to be Bruins fans. Also that the Oilers didn't event exist then.
I had another friend that pretended to be a Flyers fan in the 80's That one was just more bandwagon and ironic as the Oilers beat the Flyers in two of those cups. He was there at that game 7. lol I made sure to rub it in.
It's funny the teams chosen by these clowns as well. Outside of Original 6 or other Canadian teams you don't really see any "fans" of other teams show up in droves other than the Penguins, Capitals, Flyers, Knights and Avalanche. Nothing for the Stars, nothing for the Lightning, nothing for the Panthers despite these teams giving just as much ammo as the others to hop on the wagon.
Penguins and Capitals was bandwagon star player related. Lots of kids in that gear, but sadly (pathetically) you would see a lot of adults simping for Crosby and Ovechkin, which is embarrassing IMO. This has died off a lot lately, mores with the Capitals than Penguins. Funny aside - one of my friends got caught at a game in an Ovechkin jersey a few years ago and we still all routinely rip him for it almost every time we see him to this day.
Flyers are Original 6 adjacent team, some legitimate historical fandom there, and their fans still come to the rink if the Flyers stink.
Vegas and Colorado are the only others, and boy are they an annoying, immature bunch. Definitely isn't a coincidence that the two good teams that everyone in town bandwagons for also played and recently beat the Oilers in the playoffs (the troll element). Say what you want about the comment I'm about to make, but I think it says a lot about a person's character, and not in a good way, if as grown adults people bandwagon these teams for no reason other than to act like an annoying douche or be "different." Absolutely can't stand them.