Generally when I engage in a discussion or open a thread myself on something, I expect constructive replies backed up with some arguments. I will not reply to you if you:
1. Write without reading at least the whole OP. It is very easily recognizable by the brainfart some people let out at times.
2. Reply with twitch/4chan memes.
3. Your post/reply is backed up by nothing or is pure bullshit (ie. you post about things you have no idea about - example: talking about the state of countries you don't live in etc.
Case in point, this fellow: http://www.mmo-champion.com/threads/2294588-People-shouldn-t-be-able-to-do-this-shit?p=47199645&viewfull=1#post47199645)
I will however, reply and engage in a constructive discussion with you no matter how much I may disagree with you, if you have arguments, and remain civil. In return, I will always be civil to you.