A says "Not now, I'm swamped today."
B metaphorically pats me on the head, tells me to keep up the good work with my writing.
C says nothing because I did not abase myself in front of him today.
D says "Hallo," in the restaurant and makes a mental note to contact me privately one day, maybe even one day soon, but the days drift by and home is familiar and it is winter and not the time to try new things away from the cosy hearth.
C still says nothing. I say nothing back to him because he values my reticence more than he values me.