>>> one day at work a young trainee came to us to say hello, only from the school...:
Do you have your hand wrapped?
- Yes... there... at the training brush pulled...
and AAA. Well, I told my mom the same when my dad taught me to shake.
He went red like cancer.

The boy, seemingly educated, approached to say hello... And he stumbled on a scary backward humour. Maybe he’s just ashamed of you, so he turned red?