The boy is young and does make mistakes but so do older and vastly more experienced and dare I say it, better players.
The knockers should leave him alone and allow him to develop into the great player he is almost certainly to become.
That's not to say we can't have a go at him now and then when he comes up with a " blooper " like every other good player.
As for Liverpool supporters and others who boo him, just put it down to frustration on behalf of the Liverpool boys and herd mentality of the rest.