Oh I think this gets way deeper than some would make it out to be. Remember he is playing across from a NFL quality guard. Lets say Richie Incognito for example as we know him. Now Richie has some god given talents. He is a savy vet. He is also dirty and probably crazy. Maybe even a psychopath.
Now if you can beat him fair and square that is one thing. But are you willing to stoop to his level? Are you willing to engage in cheap shots, threats of violence to his family members, whatever it takes, to out "macho and dominate him"? Because I'm pretty much willing to bet both he, and your team's "other DT", are.
This is the line that I don't think is so easy to cross. Some can for the right reasons. Some can't even to save their own life. Maybe a little melodramitic but I think you get my point. Some people will rip your heart out and stomp on it because they can.....and then laugh in your face afterwards. Some couldn't do that to their worst enemy.