Be respectful. I know, I know they're liberals and it gets frustrating.
But our case won't be helped by harassing them and the issue is not one big site defederating from us, it's if we allow a handful of users to throw a shit-fit and harass them over it which they'll spread around as agit-prop against us to other instances to encourage them to defederate at which point we truly will be alone.
Maybe some people are fine with that but I can live with not posting on liberal instances, not dunking on their users and letting them have their political discussions without interjection if it means more instances I can generally interact with under one account. I don't think any of us here seriously think the situation will be improved by giving them cause. They'd still come here anyways goodness knows to interject their opinions so it's not like withholding posting on their platform and following their rules prevents you from being able to interact with liberals.
Just my opinion. Rather not get us locked out of the fediverse at the start by giving them any excuses. Yes they'll probably do it anyways as they'll manufacture or find one (just as reddit admins were fond of inventing new reasoning and rules to fit the occasion of needing to get rid of troublemakers) but let's try and force them to reach for a reason, not hand them one.