It is true. He growled. He was digging at a blanket and when I asked him to stop he was quite unhappy. Turns out, he needs to get fixed. He is going to the vet in a couple of weeks.
Here are some photos of him playing in his kitty cat tent. Which he used as a restroom and I had to throw away. Good news, they are only $5 at IKEA, so now he has another.