Real Madrid are used to winning trophies almost every season, and Ancelotti was sacked as Real Madrid head coach because he failed to win a trophy for Real Madrid last season. Real Madrid management hired Xabi Alonso so that Xabi Alonso could lead Real Madrid back to their glory days, but after Real Madrid played Osasuna in their opening match this season, Real Madrid fans weren't satisfied with Real Madrid's performance, and they criticized Xabi Alonso so that he can seat up and perform better in Real Madrid's upcoming matches.
This was exactly the point I was making in one of my responses earlier, the criticism is very much needed and essential, I still do not know why most persons keep making it feel like the fact that the season just begun is enough excuse to not put out any form of criticism against a coach probably because they see it as too early, they are forgetting that all of these gets to make the coach understand he needs to sit up and cannot continue that way as the people will not like it but again some people want to wait till the end of the season maybe, before they criticise as they aught.