I think the teasing and bullying of Mr. Bennett (if they turn out to be so), is less reprehensible because he seems to be grounded enough to be able to take it as well as dish it out. A true bully would not allow anyone to make a fool of him - his power comes from being inviolable. Mr. Bennett's attitude may prove to have that basis, too, but he favours the child with wit, who can give back to him. I think his humour IS humour, and not psychological games with a victimized family.