What is the reason why men cannot wear knee-high boots?

Girls usually wear boots. In fact, in Europe in the past, there were men's boots with a height of 20cm above the knee. They were the attire of senior military officers and were only for men. But times have changed, aesthetics have changed, and many of the attire worn by men in the past has become mainstream for women, such as high heels, jeans, and even men’s suits in women’s styles. According to the current mainstream, knee-length boots are not suitable for men in public places, but they can be worn in some hidden places to enjoy themselves. In fact, there is no question whether clothes can be worn or not, only whether they look good or not. This is just a personal opinion: boots are something that enhances aura, especially for men. Wearing them will make you look like a "queen" and a very "sharp" aura. If the upper body cannot produce a "sharp" effect, it is best not to wear these boots. Today's fashion is mainly soft, so it's not easy to match. But there is no sense of dissonance when matched with some European military uniforms from the 19th century.