What would you have done in this situation?

I went to a really nice bakery in my hometown to order some treats for a family gathering. The woman taking my order takes my name and goes, "Oh..." Like something is wrong. "You're not related to (my mother-in-law's name) are you?"

I said yes, she's my mother-in-law. The woman then started talking about how she felt sorry for me and that when her son was growing up he went to school with my husband. She then went on and on about what a brat/terror/nightmare my husband was and how my mother-in-law was just as bad if not worse. I just felt really uneasy by it all. I was like, "Oh yeah...right. Do you do assorted platters of treats?" And the woman just didn't take a hint and just kept going on and on about how my mother-in-law had this air about her that she was better than everyone else, or that my husband got special treatment because my mother-in-law would march into the school screaming at the teachers/principal until she got her way or the cops were called.

I ended up pretending I left my wallet in my car and I left. I'm not a confrontational person at all so it just threw me off. This bakery has stellar reviews and I've had their stuff before, but I just didn't have a good feeling after that interaction. Would that lady tamper with our food in some way?

Side note: I'm not defending my mother-in-law in any way. She's a volatile woman and she taught my husband that screaming and being a brat gets you what you want. Thankfully, he matured a lot before we got together and is nothing like her. He definitely doesn't act like an asshat! He's never even raised his voice at me and we've been together 10 years.

What would you have done?

Edit: turns out she is the owner of the bakery. Go figure. Guess I won't be back. I just don't feel comfortable buying food from someone with such a dislike for my family. I got such an icky vibe. I'd be wondering if she tampered with the food, or licked it or something.