I did come across that quote, and it reminded me of the whole 'turn the other cheek' thing.
I suppose it has to do with being generous and patient, and 'swallowing your anger' (so it never even appears) and being forgiving. It's a very high standard that only the most disciplined people could aim for.
It is a bit unnatural though. Most people would snap in anger, some with simply glower, and a few would become sullenly sad.
You have to look into your heart, and if you heart tells you that this tea on the carpet instance has no impact on your relationship is with Almighty Allah, who cares about the tea on the carpet then!