The goal is to avoid being forgettable; the goal is to make an impression. This is why controversial people are more memorable; they are not boring, and they make a strong impression, whether good or bad. Typically bad.

Also, I think we tend to remember that bad more than the good. Therefore, if you strive to make the maximum memorable impression, ironically enough, making the strongest bad impression is good.

Therefore, perhaps rather than trying to teach people how to make a good impression, we should strive instead, to teach people how to make the maximum bad impression.

Or another words, better to be a Donald Trump than a Joe Biden.