Well, it all depended.
I took losing quite well at least half of the time, I would just ask for the rematch so I could prove I could kick their asses. Sometimes, if I lost at a game I believed I was really good at, I'd throw a fit and insist they cheated/I was distracted/It didn't count because of whatever. I was a really prideful kid and while losing at a game I didn't care much about wasn't that big a deal, losing in a game that I thought I was the supreme queen at truly made me go in denial mode hahaha.
Now, if someone used dirty tricks to defeat me while playing a game (tickling, distracting me, you say it) I would get so pissed it wouldn't even be funny. Maybe even cry about it hahaha.
I was but a small child, I had no control over my emotions. Nowadays I'm really chill about it, though.