He has the right to be angry.
I would be as well.
Getting shat on by everyone and insulted also by his own fans after having played arguably one of the top 3 seasons individually for a player of the last 20 years would make me fuming as well.
At Liverpool, Messi could have sat on the fucking ground for 90 minutes and the team should have still been able to pull it out, if it's true that this team is FC Barcelona and the other players ARE PAID MILLIONS because they supposedly are the best in the world in their role (which they proved they aren't, not even close).
And instead they do blame him?
We were there playing for the CL final just because of him this year, people must realize it in their own heads. Because without Messi this team is nowhere good enough to reach that level.
In Italy, Juventus fans asked C. Ronaldo for forgiveness for being not good enough as a team for him after the CL elimination.
Here instead, many shat on Messi.
Messi had all the fucking rights to run away after the game and not to celebrate.
It's like at Napoli in the eighties fans insulted Maradona after their Coppa Campioni elimination.
Crazy, absolutely fucking crazy.
Don't play with fire, you might get burned...