def on_raw_cap_nak(self, params):
        for capab in params[0].split():
            capab, _ = self._capability_normalize(capab)
            self._capabilities[capab] = False
            self._capabilities_requested.discard(capab)

        # If we have no capabilities left to process, end it.
        if not self._capabilities_requested and not self._capabilities_negoatiating:
            self.rawmsg('CAP', 'END')
Update active capabilities: requested capability rejected.
dataset/ETHPy150Open Shizmob/pydle/pydle/features/ircv3/cap.py/CapabilityNegotiationSupport.on_raw_cap_nak