Crazy mil

So we just came over to my MIL's for dinner and she pulled a bag of frozen chicken out of the freezer and put it in a Walmart bag. She then put the chicken inside the microwave while it's still in the Walmart bag to defrost! This can not be safe at all and I'm questioning wether or not I should eat it because it sounds kind of cancerous. I'm pretty sure Walmart bags are not cooking utensils and I'm a little weirded out. I told her that you're not supposed to microwave any kind of plastic let alone a fucking grocery bag and she goes "it's not cooking it, it's just defrosting" yeah... The microwave is still heating it up though. What does your mil do that makes you question her sanity? Please tell me I'm not the only one😐😳