Growing up in an environment where mistakes were unacceptable sets the stage. Our willingness and ability to understand that that's fucked up and change our attitudes about mistakes takes more growth.
For some people it's easier to dig in their heels and double down.
That guy's just a rando dick that happened to notice you and doesn't have the emotional maturity accept he was wrong about calling you a bot. The rest of us are happy to see people contributing. Carry on :).