I knew a guy in his 30s that has similar attitudes: thinks that his ways and opinions are the only valid ones, thinks he is smarter than most people, has instant assumptions about people based on appearance, and does not take criticism well.

From talking to him, I would say that to avoid becoming someone like him:

• Do not define yourself in terms of work or money. Yes, most people need a job to pay bills to live. But find a hobby, passion, or charity that you like. Trying to make / hustle / gamble money for the sake of a larger number in your account (with no other goal) is honestly sad.
• No one is out to get you. Stop seeking enemies or blaming problems on others.
• Do not make IRL opinions from online “content” (I don’t even wanna know which subreddits and YouTube people this guy follows) Interact with real people.
• If your friends are repeatedly calling you out on questionable or insensitive actions and opinions, listen and think for a minute.