No one likes getting their ego hurt, and that includes men. Our pride depends on how we view our worth, confidence, and self-esteem. The same goes for that tough guy you thought you knew so well. A blow to their confidence can send them down a spiral of insecurity. There are so many common phrases that can hurt a man's feelings, some that we didn't even know about.
Like a backward compliment, telling someone that they're not "traditionally a good-looking guy" or bringing up the fact that you're into their friend can surprisingly hurt their feelings. Also, watch when you laugh. I have totally laughed during sex, and each time it doesn't go over well. The fact is men are vulnerable and women have more power over men than we even realize we do. Yay, powerful women!
Like all of us, men just want to succeed, so when we criticize them, even if we don't mean to, it can make them feel like they're not doing their soul's purpose. I'm not saying we need to start stroking men's egos but it doesn't hurt to keep in mind that they too have feelings. Knowing this might change the way we joke around with them. I talked to a bunch of my guy friends who opened up to me and shared the most common things that women have said that have hurt their feelings.