I have stated many times on this board I am a Cowboys fan and that I root for them (and will continue to root for them) in all situations against all teams. I find the question insulting, and I try not to dignify it with a response. Every time I come up with some bit of proof, that's never good enough. I once posted a picture of several years worth of stadium cups sitting on my mantle in an effort to prove I have been to the stadium (and am not just selling my tickets for profit), and still get ridiculed about that to this day.
So maybe now you understand that when the question comes up, I usually just roll my eyes and ignore it.
Furthermore I find it silly that, for some reason, as a Cowboys fan I am obligated to take sides with the League over the Patriots in this case. We play them once every 4 years and have never played them in the postseason (i.e. Super Bowl) so I see no reason to obsessively hate them like others in here do.