Come on man. This is such low effort appealing to Theo's public image. If this is something you feel you must describe as a personal attack, it must be hard to get around in life.
I find this response quite level headed and I like that some of his responses make it to the front page that provide insights into why such language changes are more difficult than they seem.
If I say "You have a big nose, it makes you ugly" as the first line in my email, it may well be a "statement of fact" and yet still be a personal attack. Your implication that a statement of fact cannot be a personal attack is untrue.
Whether the OP has or has not written Posix utilities in rust is of no relevance to the actual argument whatsoever, it is just a way to have a dig at the OP.
This is where Theo appears to me to be quite different to eg Linus. He plays the man, not the ball, with personal attacks.