When those clothes belittle an entire class of people. It sends a message to his female peers that he views them primarily as objects, and as human being second. If he wore that to my office, he would be rightfully fired on the spot.
The fact that you use a gendered pejorative[0] that refers to men while claiming to have a "healthy diversity of cultures" is both ironic and representative of modern PC-culture.
[0] - https://medium.com/human-parts/douchebag-the-white-racial-sl...