I apologize for my incorrect assessment. From what I read, without the ability to hear his tone of voice or see his demeanor, it sounded harsh. You mentioned this is his busiest time of year, so his response makes sense.Actually, I took it as progress because he said, "right now"
Also the tone it was delivered in and the look on his face, they were not harsh
Do you think when the busy season is over he might be more agreeable to discuss your concerns? Thus far, he has been unwilling to tell you what is wrong. I keep wondering if he wants to be awful enough that you finally decide to leave. Some people do that because it expunges them from feeling like the bad guy. I could be completely wrong. But he has been disrespectful to you for awhile.