Sorry, OP! I used to be really heavy myself, know how people can be! I would report him to the management of the place and let them handle it-surely they don't want him running off customers-otherwise, just switch gyms-what an ass that guy is! People used to taunt me about my weight, too-usually when they were in a vehicle/safely out of reach-don't let people like that get you down though I know it is hard to do!

People can be such assholes, can't they? Making fun of someone who is trying to lose weight, is like mocking someone who is sick and going to the hospital. Don't worry OP, that guy was only putting you down so he could attempt to compensate for his own failures (whatever that might be).

He was pretty?

You should have told him he needs to look in the mirror.

Simply poke him in the gut, make repeated references on how you can't resist playing with Jello, and when he inevitably delivers his slow, fat-guy punch and roars like Bigfoot, dodge his slow-ass moves until he inevitably exhausts himself and collapses into a sweaty heap.

Maybe he was talking to himself...?

Same thing happened with me except he was taunting me about being bone thin. I beat his ass as soon as he walked out the gym doors.

And that's why I don't like gyms

"Look who's talking fatass"

Are you sure he was saying it to you? I've been to gym when a overweight girl was doing the same. She was talking to herself though