He is young, he fight like a warrior and that's what we need. So I think I can understand his high temper, especially when you played with all your heart in a stressful game like this while the fans keep booing you. Just play professional sport in top level like this and you will understand. Very very frustrated situation in fact.
It's not fair for Guarin. At least he fighted with his best, and our fans should support him instead of boo him like that. But what I see in Guarin is his motivation, his "try more and harder" spirit, and we need this fighting spirit in our team, the thing we didn't see from 2 years.
I would say, ok, obviously he must control his temper next time, but don't you dare say him stupid or something. Stupidity is what Balotelli or Muntari did, not our Guaro.
So respect.