Am i overreacting, some guy in the movie theater hit my 14 year old son?!?!?!?

My son has adhd and so he fidgets allot and i took my son to see the new terminator movie. And my son was like moving his foot up and down and it was shaking some of the seats. And this man never asked him to stop, and he just punches my son in the leg and screams at him to stop. I got so pissed off and i started screaming at this guy and i was raising kane about it. My husband thinks i overreacted, please dont tell me i should of asked my son to stop because i did and thats not really the point the point is he did not even ask my son to stop and just hauled off and hit my son, what do you all think?