This huge guy at my gym “shoulder checked” me. he's also yelled at me and called me a dumbass. Im not sure what to do because I want to fight back?

When i first started going to a planet fitness this guy yelled at me and started calling me names bc i almost i guess broke his phone. He had it tucked under a bench literally on the floor. He went to go exchange weights or something I don't know but i always see him leave his spot to talk to people or something. Then i took the bench and adjusted it and he came over yelling at me. I thought no one was using it. He stares me down all the time and now he shoulder checked me. I want to do something back physically but dont want to get a assualt I don't know what to do?
This huge guy at my gym “shoulder checked” me. he's also yelled at me and called me a dumbass. Im not sure what to do because I want to fight back?
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