Counterpoint: a lot of the time, no one actually tells you why they don't want to be your friend. People want to be polite and avoid talking about your negative traits, but they end up just perpetuating them because you don't know how to improve.

In addition, not everyone has a choice in how they present themselves. If someone has a physical or mental disability they might slur words, put weird emphasis on words, or do other things that disturb other people.