Men are definitely not insecure about their height to the point that a multi billion dollar industry can profit from it.
For context, there is a huge trend of men creating new insecurities for women because apparently they are not insecure enough about their appearance. Even though women are more likely to spend time on their appearance, the beauty industry is a multi-billion-dollar industry that solely stands because of women's insecurities. Women are getting beauty procedures left and right. It's expected for the average woman to do her hair, makeup, skincare, nails, shave, etc., etc. But women having a preference for guys to be taller than them is treated like a war crime. Guys also prefer women to be shorter than them, can all tall women change their height? If men were actually insecure about their height collectively, they would be the ones wearing heels or inventing cheaper and safer option for increasing height. But no It's in the end of the day women who are going under knife.