[d--b]

No extra job activity is mandatory. You can't be fired for skipping it.

Now, a lot of people will make you feel it's mandatory. The truth is: no one wants to do this. Everybody I know hates christmas parties, poker nights, and bowling with workmates. But you kind of go along, because it's actually good for team bonding. And team bonding is an important part of company culture and to avoid friction and conflict at work.

Now, if you really hate it so much, just find excuses for not going.

And yes, if they shame you for it, they're definitely bad managers.