Thats right. That shiz aint welcome, unless you have proper reasons and are discussing maturely.

EG: Some random agmer comes in and asks:

"What console should I buy, PS3 or Xbox360?".

What not to say: "Buy an xbox ps3 is poo the online is free but sucks and has shitty exclusives, omg xbox is the best!!!!!"
Nor: "Wtf man xbox is shit ps3 is so much better cause it has blu ray and it pwns xboxs dvd reader".

Or stuff of the sort. Yet you can say:

"I rather buy and Xbox because I like explusives better and kinect is really nice, as you need no controller".

or

"I would buy a PS3 as it has free online and we can all play together" .

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You get the point. :P