This is more a grammar question than etiquette, but they do go hand in hand (it is bad etiquette to have bad grammar). My wife uses the word “well” when I think she means “good”.
She often says, “I do not like it as well” to compare two things as in, “I like the blue one one more. I don’t like the green one as well”. She doesn’t use it as a synonym of “in addition to”. We are looking for clarification on this point. Maybe I should post this in relationship advice instead!