People tend to pick one point in an argument and focus that down, its quick, its easy and it scores points for them.
When you have 5 or 6 people doing that, your entire argument cant get mis- represented in minutes because its all there to be torn down.
I find that the best way to talk in a fast moving enviroment, like youtube, is to question once.. let them think about that point before moving on to the next.
Wait until people start answering, this gives you time to put your next opinion down.
Always read what they write, there will be ammunition for your end game, be curt with responces, be short with questions.
Eventually you will have saved your best point till last, if your lucky you have got them already agreeing with you when you make it.
Just take your time, never rush