That sounds like the parents are playing nipping games at home. I'm going to eat you , I'm going to bite you - nibble nibble on cheek, tummy, finger whatever. Parents do not realize that kids do not grasp play and reality at this stage and they are really not playing with their child - they are turning them into a bully that is likely to turn around and do the same "game" to another person.

Play wrestling is the same thing. Parents understand how to make it look like they are slamming the child or punching without actually touching but others watching do not. They punch or kick or push for real.