I’m generalising but can imagine that, for a woman, dealing with a group of pissed city boys feels much more uncomfortable than your brush ins with hen do’s.
This is all ignoring the fact that this thread is around drinking during work hours. So I don’t think the comparison to hen do’s is fair in the first place.
What everybody who does not feel well under these conditions should never the less consider is: Connections are formed during these events and collective rule breaking is an effective bonding mechanism. Further more, getting intoxicated together is a convenient way to make statements and have a degree of deniability afterwards.
Now my Fridays are filled with the same monotony as the rest of the work week.
You need to make social engagements during the day with friends. Otherwise it's lonely and isolating. as a nice plus, seeing your actual friends is much nicer than seeing your workplace "friends" who'd likely sell you out for half a dollar.
Go grab lunch at a pub, coffee, do some exercise or whatever.
I soon stopped drinking at lunch though, never do it anymore, never got much work done in the afternoon and made me a bit too aggressive..