Never take things personally
In a dysfunctional situation, never take things personally, but be aware of what’s being said and how it impacts you. This is sometimes easier said than done, but in my experience dysfunctional situations bring out the worst in people. Don’t allow someone the satisfaction of bringing you down to the level of name-calling or destructive criticism.
Some people might argue that you should never take things personally, but we’d all have to be zombies not to allow anything to affect you emotionally and psychologically. It takes a strong person to heed the advice above as well. You must be confident in your convictions, but you should remain objective.