At the 0:33 mark, Reagan bows his head while approaching the Queen.
Clinton didn't bow, nor did George W Bush.
Obama bowed all over the place but his special contempt for the U.K. was on display. From the 0:55 mark where Obama's approach to the Queen commences, through shaking her hand, Obama does not bow at all.
I'm not suggesting that Reagan was the weaker of this lot, or that Obama and Clinton and Dubya are some sort of Trumpian at heart.
What I AM saying is this is much ado about nothing.
Exactly, and their claim that Trump bowed to the Saudi leader was equally as nonsensical of a claim as well. He leaned over so that the shorter Saudi leader could put the medal around his neck, as Trump is quite a bit taller.