Am I in the wrong for not spraying my cats litter box in my lawn?

I bought a house in 2017. I was renting it out since then, but recently moved in. My aunt was living in a small trailer so I offered to see if she wanted to move into my place. She said yes, and we've been living together for a couple of months. I brought my cat with me, and I have her litter box set up in the bathroom with the door open. We'll, I guess my aunt could smell the litter box, and told me to clean it out. What I used to do is empty it in a large bag. Spray some disinfectant in the box, and wipe it clean. I was gonna do that, but my aunt told me to grab the hose and spray it out in the lawn. I guess because she doesn't want me to use her rags, and she also doesn't want me to waste paper towels. I said I'm not gonna spray it outside because the litter is not environmentally friendly. She was like "oh whatever! Fine!", and I did it the way I wanted to do it. What do you think?

Am I in the wrong for not spraying my cats litter box in my lawn?
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