There’s a difference between expressing emotion in general and expecting a random friend to be able to deal with your emotions and help you. Obviously you should help your friends with their emotions, and they should help you with yours, but sometimes, especially if you have a persistent problem, expecting a friend to go over similar emotions frequently (which usually means the friend gets upset too, if they care about you) can be an unfair imposition.
I haven’t met any of the “a lot of guys” who don’t get this, but I don’t really doubt they exist, since both working through emotions and respectfully negotiating boundaries can be difficult.