A certain % of the population are just assholes. I think this is concentrated to a higher level in the jw cult.
The advice about shutting up about being treated like shit is good advice IMO. You can’t win against these types of people. Assholes will be assholes and they usually move up in the organization.
The best you can do is learn to recognize abusive types early on in the relationship and avoid them to the best of your ability.
Be as passive aggressive as you can with these kinds of pricks and ghost them when they try to contact you.