Earlier quoted context omitted.
You don’t fire a customer for being testy. It’s way disproportionate and if customers are unhappy you want to know this. Rude feedback is still feedback, and most businesses struggle to get honest feedback because most people are just way too nice
I run a business and I absolutely would fire a customer for being needlessly rude to an employee. If they're angry at the employee they can direct their 'feedback' to me. But yeah this 'the customer is always right' chunk of American culture needs to die- abusing employees is not 'feedback', nor is it acceptable
Specifically to the sales tactic, hopefully everyone knows it's a tactic, and it works because it elicits responses. People crave genuine connection and disingenuous emails like this can be trigger points, but alas the incentive structure of inside sales teams is often to elicit any response. It's the modern day "calling at dinner time because you know someone will be home" trick.