There isn't even any solid evidence for this, but millennials are getting the blame anyway! Mayonnaise is on the way out, and all the statistics prove it. During the last five years, sales of mayonnaise in the USA dropped by almost seven percent. If that trend continues, it will soon cease being a profitable exercise to sell it. Mayonnaise retailers are at a loss to explain why this is happening, with Heinz marketing head Jennifer Healy cited as saying that the condiments market is generally 'more competitive' than it was ten years ago. That makes no sense. If it was purely down to competition, sales would still be high, even if market share by brand changed.
Despite the complete lack of any connection between mayonnaise, declining sales, and millennials, Philadelphia magazine saw fit to print the inflammatory headline 'How Millennials Killed Mayonnaise' in April 2017, backing it up by saying it was all about the condiment being viewed as unhealthy. It would seem that the pattern with declining sales of anything is 'if in doubt, blame young people.'