I have to say, I don't think Russell actually does these things in real life, for the most part: they're details he fills in while he's playing a moviefied version of events in his head. When we've seen Russell in court -- one of the rare opportunities we have to view footage of Russell that he himself hasn't strategically assembled -- he's been pretty passive. He just sits off to the side and seethes, and when he's challenged he quickly apologizes and backs down. Wacky, Jim Carrey-ish Russell only emerges in Russell's accounts of his actions after the fact. Take, for instance, the bit in "Why I Sued Taylor Swift" in which book-Russell spontaneously does a backflip when he sees he's received an email from Swift's agent. I think we can both agree that Russell probably is incapable of doing a backflip, and that, in reality, when he received that email he opened it in the normal manner.
This is admittedly speculative, but I doubt that even the scene in "Why I Sued Taylor Swift" where Russell has an angry outburst at a law office bears a recognizable resemblance to anything from reality. I think Russell probably spent time brooding about how unfairly he'd been treated, fantasizing about bursting into the law office and giving them a piece of his mind. I think Russell's fantasy version of himself is far wittier and more assertive than he actually is, but his fantasy version of himself is not flawless because the scrappy underdog archetype Russell hopes to emulate is not flawless: he has limitations that make him sympathetic. I think this is also why Russell, seemingly uncharacteristically, presents many personal defeats even in his book's highly doctored version of his life: they're part of the archetypal underdog's journey. I doubt that Russell is consciously aware of this; I expect he's just spent his life absorbing these inspiring underdog tales and is now regurgitating them.
