They never engage with it because they know damn well that they have no excuse. Rather than engage in something that they are completely caught out on they resort to non-engagement.

Ironically this strategy of online rhetoric is literally in the handbook from the 77th brigade that was leaked, British military psyops. However I suspect these people just learned it naturally from many bad experiences with how that went for them. This picture from their webpage makes me laugh every time because it's literally :