It seems João Félix had a poor performance and his performance was weak enough to make Xavi mad at this player. Before João Félix joined Barcelona he said how loved this team and he wanted to play for Barcelona but this player mostly couldn't have good performances since he started playing for Barcelona,
In the game between Barcelona and Almería, the performance of João Félix was weak enough to make Xavi not use this player in the best squad in the game against Las Palmas.
Joao Felix is like Morata and they fail to face with pressure if they have to bear on shoulders expensive transfer fee or much expectation from coach and fans. They are both talented and good players but they have never satisfy expectations on them. With their potentiality, they can play better but we already saw what happened with career of Alvaro Morata. Joao Felix is younger than Morata but with likely failed adventure in Barcelona, it seems he does not fit to be in top players list. He is a star player but can not grow up more to become a super star player.
Felix's performance is not as weak as you are saying. In my opinion, the player is doing well in Barcelona, and I think the coach didn't use him because he thinks the player doesn't do well. You know, the player is still yet to understand how the squad plays and how the manager manages the team. However, this is not how Felix was playing for Barcelona, in my opinion. The player will do well, but I think it will take him some time to understand the club. Remember that when a player is signed to a club, they normally play, and people criticise sometimes that they didn’t look good in the early stages or when the player is newly signed.
He got some excellent early performances for Barcelona but he failed to maintain stable performances. Gradually his performances become worse or just some times up, some times down and surely he does not make his coach happy.
With Felix's debuts and early matches for Barcelona, I used to think that he matches with Barcelona tactics and already found a club where he can show his best. So far, it seems it's not true and Felix is struggling to grow up his career again.
alvaro morata's price is cheaper than joa felix. and alvaro morata's goal scoring contribution is also better.
Even when playing at Juventus Alvaro Morata was very productive in scoring goals. and led Juventus to the Italian league champions Serie A.
Joa Felix at Atletico Madrid or at Chelsea did not develop at all his game both in scoring goals and assists did not match his very expensive price.