Haters gonna hate
Plus I do agree with one of the comments above that the poem should apply to him. One thing I have learned from being in business a long time, its that negative feedback is gold, if you use it to turn a situation around to leave your customer with the feeling that they have been heard, been paid attention to and taken care of. That kind of customer will stick around more than a customer who used your product and it just worked fine. I love to deal with problem customers, as it is an opportunity, not a chore, if handled correctly.
Excuses are a dime a dozen, especially when it comes to cutting edge tech.