Mr Rubin said the 48 hour delay to condemn the attack by Hamas was disappointing but “not surprising”.
“His post on Twitter read like it was from ChatGPT basically,” he told Sky News host Paul Murray.
“Kind of said all of the right things and then kind of also said nothing at the same exact time.”
More than 900 Israelis have been killed since Hamas launched its assault, while almost 830 Palestinians have died as a result of bombings in the Gaza Strip in retaliation.
The death toll is expected to climb as emergency services recover bodies from the rubble with thousands more injured.