Spouses Ex giving me unsolicited parenting advice
We are a blended family and have my step daughter (15) lives with us most the time and my two girls (12, 17) about 20% of the time. The step daughter is real rebellious as evidenced by her recent shop lifting arrest. Anyway she often is yelling at me "your not her father" and "stop trying to tell me what to do"...the other day I lost it and yelled back not to talk to me like one of her "little bitches." My bad but it's been boiling up and I turned to a language I thought she might understand.
Well a couple of days later I was with my wife picking up the step daughter and her father came up to the window of the car and started giving me parenting advice. Really! His two kids are both on probation for breaking the law and mine both are honor students or on the Principles List for straight A's. Anyway I didn't say anything and felt later like I should have said STFU but think that would escalate things.
Sorry for the long winded background but here's the question. What do I do now? Obviously this has set the stage for the step daughter to constantly be going to her father anytime there is a disagreement and that's not really going to work out to well.