Acting "properly" socially is exhausting for me. I mostly avoid social gatherings because of it. For stuff for the kids I just focus on them and let my wife handle the adults.
For things my wife wants me to go to (without the kids), I will go, but I tend to just sit there and not talk. I'm fine observing. People find that socially awkward, but her friends are used to it by now.
My friends are used to me sometimes saying weird/crazy shit.
Think about it like this: yes, I can act properly. But it's like work. I would rather leave work at work.