I appreciate that there is a large number of people very, very upset [still] that their candidate of choice did not win the last presidential election, and that the person who did is too boorish to be a member of their social class.
However, this latest "controversy" is absurd for reasons that even those with a loose hold on historical knowledge should understand:
Trump breaks protocol during Royal visit as he fails to bow
American citizens don't bow to English royalty. Ever. Our nation was founded on the premise that we would never bow to the English crown.
I attended the equivalent of high school in the U.K. I roomed with the only other "foreign" students, Bob from Australia and Ian from the Republic of Ireland. When two members of the royal family toured the campus, (we'll call them Philip and Andrew), Bob, Ian, and I were placed behind the rest of the student body as it was expected that Ian and I would not be bowing. We didn't, and Bob joined with us in solidarity, and no one thought it inappropriate.