Is it normal not to acknowledge former teacher/schoolmate
So today i was riding the bus home when I noticed this really familiar looking guy who was traveling with a small group of kids.Obviously, he was a teacher.
But specifically he used to be my teacher,or at least a teacher at my old school.
Anyway,I was looking at him,and he looked back and waved at me.And I since I wasn't sure if I was right(and didn't know him anyway) I just kinda ignored him.
The kicker here is that on the next stop over a couple of my former schoolmates also got on the bus.When they saw him they waved and he wave back said hi and stuff.And I was just standing there looking out the window feeling awkward...
So is it normal not to acknowledge former schoolmates and teachers?