Is milk bad for you? it seems less fashionable?

Your question answers itself. If your more interested in trends there are milk substitutes that are trendy. Milk, either from the mother or the most common substitute in the US, a cow, is the easiest most available way to provide protein/calcium and fat to growing kids. It has been so for millennia & will continue. Whether it is the best choice for a given persons diet is based on other factors.

Milk is not bad for you. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Get HPV and Covid vaccines. Wish you good health!