When discussing leftist, or multiculturalists, or cultural Marxists, or whatever you'd like to call them, it's good to remember that there are two kinds of them. The majority are just naive dupes, while for the most part, their leaders are cynical, hypocritical, lying swine. The latter know just what they are, and they're happy about it. They deliberately use the threats, insults, etc., because they know very well that they don't have any real arguments.
The followers, the naive dupes, mostly think that they are presenting arguments when they call you names and threaten to destroy you one way or another. As I've said before, the left thinks that asserting an opinion constitutes debate, and that memorizing slogans constitutes education.
So how do you argue with these special little snowflakes? Do you resort to using their own tactics? That's a tricky thing to do, because it can lead you into bad habits in other ways. And, of course, actual reasoned argument seldom works, because the dupes don't know what it is. It's like discussing algebra with farm animals. So what you do is use the simplest possible logic on them, something even they can understand, and respond to their foolishness with a question very easy to understand, but very hard for people with no substance to their thinking to answer. Gregory Hood explains, from Counter-Currents:
Quibcag: Sera Masumi (世良 真純) represses dissent from Mouri Ran (毛利 蘭). Both are from Detective Conan, AKA Meitantei Conan (名探偵コナン).