Struggles with my 3yr old

Erica

Lately my son who is obviously 3.(group name lol). Has been terrible. Talking back, hitting things when he dont get his way, not listening. I discipline him. He gets a flick to the tongue, or a butt smack, time out. Nothing seems to be helping.

Please tell me this is just a phase!? Anyone have any advice that worked with there kids if they went through this?