She’s never treated another person rudely.
Your home is out in the middle of a coarse looking field. Whenever you bring friends over the only word they say to describe your dirt and grass home is that it's rustic. That's pretty rude of them, you love your dirt home! Even if it is kinda small and stinky and in a field.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.