+1000
Can I add to your excellent post? People who don't see when they create their own problems, such as your example above. Especially in those "old enough to know better".
This includes older folks who are nearly impossible to have a conversation with because they can't hear and won't get hearing aids! My mom falls into this category, keeps complaining about how she can't understand what people are saying because they don't speak distinctly. She sometimes admits she can't hear well, but won't do anything about it. Come on, mom, use yer noggin!