To be fair, he's doing so while referencing a response from that developer that was just as insulting. I don't want to get into a debate over whether two wrongs

To be fair, he's doing so while referencing a response from that developer that was just as insulting. I don't want to get into a debate over whether two wrongs make a right, but the flow was "Systemd is not good", followed by a reply of "you're just a child throwing a tantrum", then followed by the insulting tweets.