It's rude to ignore people you love.
Gary's mom is always trying to call him to chat, but he ignores the calls because he is working.
Gary's mom wants to have a conversation with her son.
Gary's mom listens to Gary' schedule and starts calling at a different time.
Gary's mom keeps calling at inconvenient times, ignoring Gary's schedule.
The relationship is preserved and Gary's mom gets to talk to her son.
Gary gets annoyed with his mother.