Am I the Asshole?

In the ferret section of KSL, a guy was trying to sell his female 5 month old ferret for $600 and included pictures that looked like they had just been taken for the listing. The very last picture was the picture of the setup, and It made me a little sad, as a ferret owner. The cage looked as big as my best friends old rat cage but instead of vertical, it was horizontal. Although I kept a thought in my head that maybe they free roam her a lot (🤞) The cage had one shelf that was dirty with pee and poop. I couldn’t tell how old the poop or pee has been there, but I couldn’t believe the audacity of not cleaning your own ferrets cage that you’re selling with your ferret for $600. I messaged him and sent him a long paragraph of my experience, care, and asked if he’d ever be willing to rehome the ferret for free and that I have all supplies needed, and have a lone ferret as well that lost his play mate 6 months ago. A day later he messaged back asking if I was still interested and said he wanted her to go to a home asap. I didn’t answer that day, but the next day I messaged him and sent him pics of my setup and enclosure. I then sent a follow up text the next day, and today I seen another ferret listing, but the same exact 5 month old ferret, under a different persons name. At first I thought it might be a scam since there were now 2 listings of the same ferret, so I texted the guy back assuming that he was ignoring me, and that I respectfully hope that he free roams his ferret for at least 5-6 hours. He read my text, and a minute later had a whole paragraph typed out. I was in shock when I read what he said. I don’t understand why he was so upset, but I understand why he could be upset. I never meant to go too far about the metal water bottle or the free roam thing, but I didn’t know how to come off in a better and respectful way? Was there a better way to word it? Now thinking about it, I should’ve tried not to text him so much. I just had concern over the ferret :’) Overall it makes me disappointed and sad, and I’d love to know what you guys think.