I almost got into a fight today. This dude at lunch (not giving names) asked me in a somewhat demeaning manner if I've ever been in a fight, so I said "No, but if that's an invitation, I'll have you on the floor in two seconds." So just before the fifth period bell rings, he's in the classroom with a glass clipboard coming after me. I hold him off with my fist, smash the clipboard with my binder (a big chunk flew off of the clipboard) and he ran away while I repeatedly hit him on the back, until he grabbed a heavy-ass classroom book and came after me, to which my evasion skills came in handy. He chased me around the room a bit until I grabbed a book of my own and it was getting close to a standoff. The teacher saw us and called the dude over to her. I pled my case, and he was standing by the door with his hand on the book, telling me to get away/fuck off when I told him to let go.
Bottom line, there are very childish ways to handle being told that someone can beat your ass very quickly. His actions are one of them.
I probably had it coming for making the remark, but he could've handled it more maturely.