If I was a Chelsea fan I won't be bragging about that finals because of the team I'll be playing against they shouldn't forget that their opponents are the Champions of Europe that are doing every possible to add to their trophy and merit being called the best team in the world. I'm not saying it's impossible for any team to win them yes it's possible but we're talking about PSG here a team with the best squad and manager in Europe the previous season.
The fans will always proud of the team they support. It doesn't matter how strong the opponent is gonna be faced by their favorite team. Supporting their team whether they win or lose. The real fans don't have crab mentality.
Typically, diehard fans are like that. Always supporting no matter what. But I agree with GiftedMAN opinion, Chelsea fans shouldn't get too cocky before the match starts. This final opponent isn't a team to be underestimated, even though PSG haven't looked particularly strong in a few seasons ago, but this season is completely different. I'm not underestimating Chelsea, but the squad currently boasts young, ambitious players. However, I do see a slight weakness in Chelsea defense. This will be very worrying if Chelsea makes one mistake, PSG will continue to break through Chelsea defense repeatedly.