Sorry your grandma is getting on you. Like Kia said she is from a different generation. My grandma wasn't .English, but she was set in her ways.
When my daughter was little, she used to tell me everything I was doing wrong. I just smiled, listened, and thanked her for the advise. I took what she said and used it if it made sense, and rid my brain of it if it didn't.
I hated hearing all the things I was doing wrong, or what I could do better, or how the new way we do things now is ridiculous. I could have screamed.
Today, I would give anything to hear her advise, because she is gone.