I understand your point mate, it makes no sense to be a plastic fan, a real fan would also support their club in tough and difficult times so I support that Chelsea fans should express themselves and think positive concerning the finals on Sunday, it doesn't really mean that they're bragging, other fans could picture it as that but in reality they're underdogs motivating their team and hoping they'll be victorious. Talking about luck Chelsea is the luckiest team in England, when they won their both Champions League trophies they won it as underdogs and no one could believe, maybe history could repeat itself, hopefully.
Chelsea is not down and out of the final because they have also done good in early games and have chance to play this big final which is going to be played after few hours PSG is surely best team due to their recent success but still any result is possible because they are balanced clubs.
Chelsea can give surprise with we are going to have few good numbers of goals in this game because both teams will be tried to play open game which will make things interesting and fans will be able to have entertaining soccer from both top-quality European clubs currently too much hype about PSG creating some confusion for me because soccer is always full of surprises. Chelsea also have good depth and their performance is also good but PSG ruined Real Madrid which is surely big advantage and their players are also full of confidence but still they needed to be stayed on earth if they want to win this final.