Common social flaws that most of us (myself included) are guilty of.

[Raxion]

He meant some people don't know how to take advice (aka negative criticism). "Don't tank there, tank here." "Don't pull with provoke, use shield lob."
Some people get mad when given those kinds of advice.

Precisely. Some people just don't like to hear that they're doing something wrong, or could be doing something better. Instead of embracing the fact that they could be doing something wrong, they instead take offense.