You know what I don't like about "Friday beers" in the workplace? It's not the beers. It's the fact that it's a company-scheduled and company-sanctioned event. The company is trying to (pick your favorite interpretation)...
...paternalistically manage our social lives
...tone-deafly intrude on them
...desperately be a part of them
...co-opt something cool and make it corporate
...do the adult equivalent of turning children's unstructured play time into a scheduled, paid-for playdate/lessons/"extracurriculars"
I'll pick and choose my friends and invite them to beers myself. In a bar. Away from the company offices. So we can talk shit about the management and people we don't like! What fun is life without the hating? (Well whatever, I just betrayed myself as a Gen Xer by being so forthright and gauche as to admit that I recreationally hate on people.)
My employer is not my friend. My friends, I will defend if they're in trouble for the next 40 years. My employer, I will ditch at the very first sign they're in trouble, or making trouble for me. Therefore I think maintaining a separation of "work life" from the private realm is appropriate. Of course, the more your "work is your life," and/or the more the company is actually yours, this applies less. But even in that case I would still recommend a healthy (hygienic) separation of concerns just like with any software system.