The Celestial Supreme didn't seem surprised that the god of fate heard what he said about him back in the privacy of his divine kingdom. It is common knowledge among the gods that the god of fate can hear about events he isn't present to witness. No event that concerns him or involves just stating his name can be hidden from him. He shouldn't be able to do so to the celestial supreme but what others don't know about the god of fate is that he is a celestial god too.
That's the second reason why the god of order didn't flare up when the god of fate disrespected him. There's a third reason why he didn't flare up but that's for another time. The god of fate being a celestial is why he can go scot-free from attending divine council meetings.