I caught DH smacking 14 month old DS today. DH put some foam corner guards on a few tables and DS immediately got up and started chewing on them. DH said 'no' and pulled DS away. Them DS went straight back to one of the corner guards. DH then smacked DS on the bum.
On quite a few occasions previously DH has slapped DS on the hand or flicked his fingers hard enough to make him cry to punish him for grabbing something he shouldn't be touching.
DH accuses me of being too lenient. He says that DS only throws tantrums when I am around and that he never cries when I am at work. DS makes very loud high pitched squealing noises all the time (he even puts his fingers in his own ears when he squeals) and DH says that he squeals because I spoil him too much. In the car this morning DH ordered me to splash water over DS's face every time he squeals.
DS is also quite clingy these days. Often DH asks me to do something and it takes me a while to complete the requested chore because I first have to find a sufficiently engaging toy to entice him to the floor, or because I have to complete the chore one-handed whilst holding DS. DH frequently gets impatient and orders me to 'just put him down and let him scream'.