I do have insecurities, but they aren't particularly terrible. I definitely appreciate outside validation from people I respect, but I also disregard the opinions of people who I have no desire to emulate. I don't differentiate constructive/destructive criticism based on intent, but rather on whether I personally find the criticism useful.
Returning the cold read, your first interaction with me is to try to seek out weaknesses by blindly fishing and hoping to analyze a response. You also like to feel superior by assuming that others have a low self worth, so you value high self esteem in yourself. You also posted this on a topic started by someone who was genuinely asking advice, so you prefer to try to analyze targets who haven't sought out your advice rather than give constructive criticism to those who seek it. You probably have a huge ego, a sadistic nature, a desire to fuck with people, and an overwhelming need to feel in control. I'd try to extrapolate that into your parents and childhood, but that's a bit too Freudian for my tastes.
I'm not sure if that was defensive enough to carry on the conversation, but nice to meet you regardless.