Tough customers, once won over, can prove to be extremely loyal. And in this case, the customer did Squarespace a favor by pointing out a flaw in their customer service approach. Undertraining can in fact be a systematic failure.
Unless the customer is causing you a major amount of aggravation or costing you money, you shouldn't be happy to see one go.
Also, FWIW, I don't think citing a comment in which the commenter calls the OP an "egotistical bitch" twice is good support for an argument.
I find it fascinating how Tesla is approaching this from both ends, supplying both the vehicles and the power. If the electric vehicle trend goes their way, they'll have an enormous advantage in the market. But if Tesla goes belly-up for whatever reason and the charging stations had to close, Tesla owners could lose their primary fuel source.
I remember that; I seem to recall it being eventually tracked down to a run of keyboards coming from a particular manufacturer that was using bad rubber. I was working at a Mac repair shop at the time, and before they sorted this out, we'd have to give all the replacement keyboards a "smell test" before using them or sending them back as bad parts.
For anyone looking to learn more about Switzerland's robust and imaginative defense system, John McPhee's La Place de la Concorde Suisse is an absolutely fascinating read: