Can you confirm that continuing to use autocomplete in a code base against the policy of the project does make the person a jerk?

Yes, actually. Knowingly violating the policies of a project while pretending you aren't, so you can continue participating in the fully voluntary project, does make you a jerk.

If you don't like the policies they set, just leave.

I'm willing to bet that every single person on here complaining has zero contributions to PostmarketOS.