Well, to take the analogy a step further, if you go out on the street and start pushing people around, and one of them pulls out a baseball bat and beats you to a pulp, should you really complain that they didn't just push back? Nope. You just had it coming, and if you are such a macho street-fighter you should accept you got owned that time.
Sure, if you were in a dojo practicing martial arts - an environment that is safe where engagement has clear rules and often a judge - then it's a fair point to make. So if you are in a very specific context that is intended and structured for open and fair debate (e.g. a debate club), that's a fair argument.
That begs the question of whether a university is such a place. Undoubtedly some of it is. But I do not think all of the university, all of the time, is. Just as going into a gym and doing a judo throw on someone in the middle of their yoga class is not right, even if the gym has judo classes.