It's a matter of showing simple courtesy to a colleague.

When we meet in public places, he has never ceased to show me courtesy.

"It would not harm you to show some respect, or at least courtesy."

I thought he showed courtesy, consideration, and a desire to learn.

Surely you delay too long and are not showing courtesy.

"I think people are driving more aggressively today and showing less courtesy."

"Perhaps we might show courtesy by keeping our backs turned?"

"I am ruler of this world and you are invited to show courtesy."

You just have to show common courtesy and use common sense.

"People here know how to show courtesy and respect," she says.