Lose? A video game???!!! NEVER!!!!!!! Just to make sure to never lose a game, all I ever play are farmville-style games where the narrator marvels at my superior strategic positioning of my coleslaw field and then faints at my genius tactical decision to water it. Yeah...take THAT, world! NOW WHO'S ON TRACK FOR WORLD DOMINATION, EH???!!!
Ahem...in all seriousness: I mostly just shrug off a loss. To me, the win- or lose state is but the outcome of all the time before it, and what matters is whether THAT was fun. And that usually was, because I don't keep playing games that I don't like. And no, being on the losing side doesn't mean I like it less. That is just when I get the feeling that me playing well or not isn't an influence.
An example on that: in one of those wiiu mario party games, I decided to just try out a match. You know the kind: roll dice, play a bit of minigames, roll more dice, and a virtual snakes and ladders thingy. Now...I managed to win all the minigames (about 5 or 6), but due to bad luck on the dice I ended up last. Result: I felt kind of

. It was the last time I played it...or ever will again.