No one has ever been happy with loss, and note that the core essence of engaging in gambling is to make profit even when it is a two sided effects either to loose or win.
however, talking about countenance i will rather say that 95% of gamblers are always happy and more excited when they win than when they loose because winning comes with another dimensions of joy than loss .
We have some gamblers that win a lot and don't get trigger or upset over any gambling loss, they see it as normal process to win in gambling, you can't win money if you don't loss, it's impossible to achieve that unless you are cheating in the gambling or some sort of software which we both know that if the casino should find out about such behavior, your account is as good as gone and your money in that account will also be gone forever, just know that gambling loss don't make some unhappy.
No one has ever been happy with loss
Totally.
No one's going to celebrate his losses and much better with the anticipation that he's going to have a good day but the opposite happens, that's destroying the day of a gambler.
Even I, I wouldn't be happy to see that I am in losses on this day but then I am expecting to have some decent wins and with few losses. But if I go home with nothing, that's totally destroying my entire day and even will give me a bad sleep.
I will say my situation is different on how I react to loss. I don't get sad any time I lose a game and what I do is that I remove my mind from any game I play because as they used to say it, too much expectations from a game is going to disappoint you, it's better you expect nothing to have surprised win later than get loss that you don't want to see at all.