I got into a fight with an MMA fighter who was about 130, and I was 240 lbs at the time and not to brag but I am extremely strong. I won pretty easily, but he has only fought maybe 3 local fights and overall is a giant bitch lol. It was nothing to go home braggin about. He did start the fight however, mainly over his ex girlfriend being obsessed with me at the time.
My roommate went to D2 wrestling nationals and is about 200lbs and would whoop my ass no doubt. I also think a majority of well trained MMA fighters would kick my ass too lol. I have only a little bit of fighting experience, but certainly not enough to make me feel confident enough to start shit with someone, no matter how big I am.