It's rude to ignore people's complaints.
Eric asks John if he can open his windows a bit in his room to make it smell better.
John wants to keep his utility bills low.
John compromises with Eric and installs insulating windows that can be opened a bit while being energy efficient.
John pretends he doesn't hear Eric and says windows have to remain shut.
Eric appreciates John's concern for him and likes him more.
Eric resents John and considers moving out.