You don't have to tell anyone anything, especially when they didn't ask, and didn't make any representations one way or the other. It's a management issue. Picking on girls is easy. Doing it with men could land you in the hospital.
Last time a fatass messed with me I ended up on top of him knocking the shit of him. He couldn't move like me hell he didn't even know what was coming when I went from sitting on the ground to leaping 7' across a living room straight to his face.