This happened at the weekend, I was talking to some girl, she was giving ioi’s was going pretty well then this happened

Her: “Do you work out”

Me: “Yeah couple times every week”

Her: “I can tell, you’re a pretty big guy”(playfully punches my shoulder”

Me: “For you”

I panicked as soon as she said it and looked autistic AF. She looked super disturbed after I said it and looked at me like I had just crashed a plane or some shit, how could I stop doing this in the future?