I was around in the days of Captains staying in separate hotels. However I don't remember Flight Crew being excluded from room parties at all.
In fact I very well remember the 'chaps' bring fresh supplies to the bash.
I also have great memories of pilots arranging activities for all such as going sailing, hiring cars (and mini buses) for trips out, going on a light aircraft flight with them flying usually arranged at the room party.
I thought this nonsense would stop by now but sadly some people would make their own life a misery just to take it out on the 'perceived enemy'.
please............