I disagree from a conceptual/philosophical perspective (broken accessibility is bad delivery, not just occasional mishap/edge case for some small set of customer) and from a practical perspective. It's not an occasional customer, it's a huge chunk of the marketplace. Here are some stats: https://themeisle.com/blog/web-accessibility-statistics/

I don't think software shop owners that are ignorant of or ignoring accessibility are necessarily jerks. Before being informed, they are transgressive to good sense; after being informed, immoral. How they act directly towards someone is what defines whether they are a jerk or not, and that, in my mind, is not really connected to the conversation.