My opinion is feel free to dunk as much lib in another instance as you want, but do it with an account on that instance. This serves many purposes. If you get away with it, it helps change outside opinions on that instance leading others to think your take represents that instance. It helps you get away with it because mods are more likely to think you're part of their community, as do the users. They will be more likely to take your take seriously. This also helps keep the heat from Hexbear more generally. It also helps keep everyone federated, which maybe you think is good or maybe not, but trying to force defederation by being an ass all over on a Hexbear account is honestly pretty poor form anyway

It's simple combo of opsec and image. Keep yourself clean on the Hexbear side and make your mess locally to that instance. It's what they do to us. Don't make it easier on the libs by showing up in your Hexbear uniform. To dunk the lib in their house you must first pretend to be the lib