It does not look well for an outsider looking into Ruby maintenance to see a technical discussion devolve into a discussion about politeness and race. Luckily matz made the right call.
Felipe is right that: 1. `%s %z` is inconsistent in ruby. 2. He has consensus everywhere else. 3. Nobody has provided any good technical arguments against his.
Whether he is polite enough or not, code talks, bullshit walks.