I feel as though if you talk poorly about someone, you shouldn't get mad at someone else for doing…

I feel as though if you talk poorly about someone, you shouldn't get mad at someone else for doing the same.

For example, my boyfriend's mother has this in home care lady that doesn't do anything but sit here, play on her phone, invites herself into getting in the fridge and cabinets, and occasionally invites herself to what we are eating for dinner if food is cooked that day. She even washes her clothes and takes a shower here. His mom says nasty things about her and how she's tired of her and needs to get rid of her and blah blah blah. Well, when it comes to my boyfriend saying something about her, it's always, "You need church!" "You need God in your life." 🤔😒