Nobody needs videos telling them how to argue. In fact, these videos tell you NOT to argue, because these people are not simply across the political divide. They are disingenuous Nazis looking for any means to make their reprehensible ideas mainstream. The best thing you can do is not play their game.
As the videos point out, that's not natural for most lefties. They feel they can change minds with a well reasoned argument. That's not what's going on here.
That's also disingenuous though, no one on the internet gets their minds changed, or is looking for their minds to be changed. Let's be honest it's all really just fantasy politicking and on the internet people tend to take the most extremist viewpoints because that gives you the most attention.
Just look at this forum, I'm not going to get a reply by saying "Racism is ugly." Everyone knows that. I only get attention by taking an extremist viewpoint. The left does it too, I mean why is it cool to use "mansplaining" instead of the gender neutral condescending? I mean jeez is sexism really the ONLY reason someone will talk down to you? Maybe it could be that they're older than you or have the opinion that they know more (due to either having more experience or holding a position of authority). And they might be wrong on both counts but it has nothing to do with their gender. Why will liberals on Twitter throw out purposeful flamebait like "Kill All White Men" and state "I hate White People." It's not to strike up meaningful conversation it's to piss off a white guy.
Look if we all just talked face to face we'd for the most part have pleasant friendly conversations, because only a very very small minority of the population is truly vile. If you take the internet 100% seriously you'd think we'd be on the brink of civil war, truth is we're adapting poorly to the openness of the internet. The internet has sadly made it so that the loudest mouths hold a lot more sway than they would even a decade ago. No one wants to be pleasant on the internet that's why everything now turns back to politics.
I really recommend the documentary "Best of Enemies", about Gore Vidal and his feud with William F Buckley. It really shows how public discourse has gone to shit. If two really well educated men ended up arguing like assholes on TV normal joes have no hope whatsoever.