What do you call a GREETER who doesn't greet?
"I can't seem to find a single English word which expresses the opposite of greeting, to descibe what we do when we say goodbye. Any ideas?"
A VALEDICTER perhaps?
The english word that refers to failing to greet someone when you are supposed to is 'snub'. Therefore Greeters who don't greet are Snubbers!
As Lionel Ritchie onced sang...Say you..say me..say it together...naturally..