Mayonnaise
Remember when mayonnaise used to be totally cool? Okay, neither do we, but bear with us. Somewhere along the line in condiment history, someone decided that mayonnaise was out of style, and the millennials have definitely taken note. Because of this, mayo sales have been dropping for the last few years.
Part of all the anti-mayo hate out there has to do with its health benefits – or the lack thereof. The mixture of egg yolks, oil, lemon juice, and vinegar does not exactly lend itself to a healthy diet. Instead, millennials are replacing the condiment with more organic alternatives like avocados.