Most of these are only for formal settings. Honestly, I haven't even heard of some of them. Aside from Tatebashi (sticking chopsticks in rice), they’re mostly avoided for hygiene reasons. As for Nigiribashi (clutching them in a fist), it just looks a bit strange for an adult to do.
Given how many of these are clever tricks that I learned from seeing Japanese people eat, like aligning the chopsticks quickly in a plate or cleaning waribashi from splinters by rubbing them together, I’d not take all of these seriously, but it’s cool to know nonetheless.