I’m so tired of my mom’s emotionally immature behavior

I honestly think my mom and grandma are the most immature people I know.

For context, I already have low contact with my mom because of years of toxic behavior. I’m so tired of her emotionally immature and honestly dumb behavior. She acts like a child and it’s exhausting.

Today she came over laughing and told me a story about how she and my grandma were arguing in a store about who should pay. It escalated and my grandma pushed her, which made my mom fall. Luckily she didn’t get hurt.

But she was telling the story like it was the funniest thing ever. Meanwhile I’m just thinking how toxic and ridiculous it all is.

I don’t even know who I should be more angry at anymore. It just makes me sad that she never seems to learn or grow.

Has anyone else dealt with parents who act this emotionally immature? How do you deal with it?