Funny, it's my dad who is most likely to complain to a company if they don't deliver a satisfactory experience. He's most definitely not a milennial. And you know what? He gets results.
The idea that it's a new thing that people expect companies to care what their customers think is the most comical milenial hatred BS I've ever seen. Companies like to make money, and unhappy customers aren't good for the bottom line. The only time it's not true is with monopolies.