I think that it is perfectly fine to post something against certain platforms on VGC.
The best example is Kinect. Somehow you can troll Kinect as hard as you want and nobody will even warn you.
I like Kinect. I play it every now and then when some friends come over and we have a good time with it. Dance Central 1 - 3, Kinect Sports 1 & 2, Kinect Adventures are actually fun! And for every movie I rent, which I do quite frequently, I use Kinect voice control.
When MS opens a new studio, you always see "Ah this is probably for Kinect crap!" and nobody gets banned for it. Or when it comes to debating about exclusives Kinect games aren't even considered.
Or in nearly every next gen thread people argue like Kinect 2.0 would be a disadvantage. The fact that VGC undertracks Kinect by 5 million does not help either.
Is it okay to post something like "Ah, this is probably some Playstation / Nintendo crap!"? I doubt it.