Juan as a die-hard football fan it's common for fans to seek the shadows when nothing goes right, and come out in the sunshine when all is well. To completely go ape-shit on a person over something as trivial as that is extremely juvenile IMO.
Telling someone they have no right to an opinion because they're not a fan is also an extremely lazy and juvenile mode of reasoning. Everyone, no matter how passionate or otherwise they are about football, has a right to an opinion. But you mentioned XE - on that forum, clearly people had the right to an opinion as long as that opinion never questioned the motives or methods of certain individuals. That's another can of worms though, and let's stick firmly on to the matter at hand here - your obvious frustrations at Barcelona and their fans on here, or maybe particular fans.
Let's look at the facts - Barcelona blew it in La Liga, and blew it in the Champions League, especially in the first leg when they failed to get a crucial away goal. Real Madrid's exhausting victory over Barcelona was detrimental to their defeat against a very good Bayern Munich side. At least Madrid can bask in the glory of winning La Liga, as well as waving cheerio to Guardiola as he steps down from his post. But Juan you are talking like the absolute worst kind of football supporter - you speak of your pure absolute hatred for one club instead of revelling in the glory of the club you follow.
For shame!