The reverse nod

Here is a fine example of hate speech a “friend” of mine posted on Facebook. It includes ageism, racism, sexism, and discrimination based on sexual orientation. 

I think the handshake has gone the way of all the world and will never be used again. I was thinking that maybe the bow would replace it in formal meeting situations. After all, a huge percentage of the world uses or has used the bow. But when I was discussing this with a coworker, she came up with 4 other alternatives: the wave, the salute, the nod, and the reverse nod. The reverse nod involves jerking the head back once as if to say “yo.”  You know what I mean?