street fighting

i read in other forums and realize it was true and theres alot of people in my gym that i workout in ( not boxing gym, 24hr fitness) that has ego problems, and think because they can lift up the side of a building they can beat any1 and knock out any1 and walk around lik they are the **** and try to be bullies. i really never say anything because to me fighting doesnt solve nothing, but can like even a boxer who been boxing for like 5 months - a yr , or maybe a novice boxer with 5 fights can take on your average guy? 1 reason i did boxing was self defense cause at my college i used 2 go guys would drink alot and flap they lips and just randomly fight guys for no reason. some guys who train as mma fighters just pick on fights for no reason to seem like they are "mr. bad ass" what do yall think bout this? can a novice boxer at like a welterweight middleweight lvl take on a 190-220lb football player or weight lifter at your local gym?