The disciples did not hate the children, but felt that kingdom matters should be prioritized over the children: that Jesus had better things to do than dealing with children who could not understand his teaching. This is why they hindered the children from coming to him (Matthew 19:14) with their rebuke.
The disciples do not rebuke the people because they hate the children, but rather because they were occupied with the affairs of the kingdom of heaven. They think that these important matters ought to be prioritized over the children.1 In other words they argued that Jesus had better things to do than occupying himself with little children who did not understand his teaching anyway. This is why they effectively hindered the children from coming to him (Matthew 19:14) by means of their rebuke.2
13 Then children were brought to him that he might lay his hands on them and pray. The disciples rebuked the people,