Amy, not sure what Embarrassed Mom will gain by making a sarcastic remark like the one you suggested. Do you want her to add more flames to a fire? That Embarrassed Mom goes beyond mentioning their ages by adding that they are part of the “hippie generation,” implies the attitude of what else would one expect. Mom has not approved of her children’s choices for a long time. That her children “brag” about having not written a “single thank-you note since they left home,” suggests that Mom must have made a really big deal about this to begin with. It’s unfortunate that at their ages that they are still rebelling. Have to wonder how often Mom still criticizes them for them to even make such remarks. Embarrassed Mom most likely needs to keep her mouth closed and respect that as adults they have chosen how to live their lives. It would have been helpful, Amy, to have pointed that out. Also, explaining to Mom that there are other ways of thanking people, such as calling or thanking one in person, would have been appropriate. If they are rude, there is nothing that she can do about that. You were totally off base on this one.