spin doctor
never do anything downroute apart from order overpriced cr@p on room service and are at best barely civil
I get the impression that you (and some of the other pilot posters on here) take it quite personally when your crew don't want to socialise with you so I thought I'd give you a different way to look at it.
On a 3 sector day we will have said hello and goodbye to about 400 people, we will have been talking to each other for 9 hours and already have the small talk and life stories out of the way, some of us will also have had numerous adhoc conversations with our customers about their life stories as well. In fact part of our job description is 'chat'. After all that chat, what we crave sometimes is a bit of peace and quiet. The thought of coming out to a noisy or smoky bar, that we have been to a dozen times, with your good selves and making more small talk is sometimes (not always) just too much. Add in the fact that many shorthaul crew are mums with young families and perhaps the lure of the quiet hotel room and a bit of room service is not so strange.
I do understand that your work day is different, that a lot of your conversations in the Flight deck are routine and procedure driven and so you can't wait to relax with a beer and a bit of idle chit chat. I don't imagine you want to get the Xbox out and start playing Flight Simulator games which would be the closest equivalent. There's no malice intended when we don't come out, no deliberately being boring, no hermit tendencies; it's all in the type of day you've had.