It seems like Ryan Sarver, along with the senior and/or PR people who most likely collaborated with him, is trying to channel the tone of Steve Jobs’s “we don't need any more fart apps” speech.

If nothing else, I think it’s advice developers should seriously consider heeding if they want to create value (and generate revenue) using the Twitter ecosystem.

Regarding whether the tone is “hostile” or the message represents “a kick in the teeth,” I think people need to keep some perspective: A hundred and how many million tweets a day?! That's a lot! If I were responsible for the big picture at Twitter, supporting your junior high science fair project Twitter client would not be at the top of my to-do list.