Do whatever you want, this is your life, but keep in mind, that you are basically downgrading yourself exactly to the people that you are hating on.
Remember that Bayern fans received a trashing by Barca in 2009 and were victims of heavy verbal abuse and mocking of many Barca fans. Later they were justifying their own stupid and provocative behaviour in 2013 just with the same reasons as you do that now. They are basically YOU, but supporting another team.
Lets say Barca wins this, you and the other guys who are looking for trouble, are having a field day on every online forum in the internet, then Bayern fans (newers and olders) will remember that, will live with that hatred for your stupid behaviour, and then some day in lets say 2018, Bayern trashes Barca again and then these guys will piss off the Barca fans. The nice ones and the idiots, and then these Barca fans will also get pissed and do that later aswell, and so on and so on until eternity.
This is basically a doom loop. This is how extremely stupid rivalrys get created. I'm not talking about reasonable rivalrys with history, like Barca and Madrid. i'm talking about "hating a club because of the internet".
The trick is to basically break this doom loop, keep it nice and classy. Show respect even if you HAVENT experienced it in the same way and treat others the way you'd want them to treat you. An act of intelligence and self-awareness.. If you want to play "king" in the kingdom of idiots, go for it. But if you want to be better than those you hate, then reconsider your behaviour.