That's not really even true. Alexis' attitude was lauded at Barcelona, look at Cruyff's comments after they sold him, he holds him up as an ultimate team player, and that's how he was really considered there. Barcelonistas gripes with him were simply with his quality, if you talk to Barcelonistas to this day they just don't think he was good enough for Barça, and also his finishing and decision making, because his finishing and decision making (as it can sometimes be for us) were poor as he seemed to struggle with self-confidence in his first couple seasons there (before the last when it started clicking for him more), including a few horror misses a lo Gervinho.
But being regarded as regularly selfish/greedy? I'm afraid you've made that up.