This is the attitude I think the author should be writing about. It should be that you love your partner, even with their trivial flaws.

The glass was never the real issue. It’s a sign for the relationship going off the rails. Not a sign that the author should just put the glass away blindly. It might be a sign that the author can listen more. Or it could be a sign that the woman doesn’t love him enough, or frankly isn’t capable, of letting the little things go. The glass is just the tip of the iceberg.