First I have to question how you are getting comments in a for glory game mode. Other than "with friends" that have preset short written sentences on it, there's not much to really say at a given instance.
I personally enjoy when someone rages at me. A level of maturity sometimes can be considered, but more than likely it's just his normal response as a person. You'll have to get used to it. It's one of the perks of being good.
If I lose oh well. I never stop improving so it's not like I completely fail when I start losing. I'll get angry sometimes. Disappointed that my efforts didn't bare ripe fruit, but they bore fruit all the same if you catch my drift. Winning is just good practice and losing is a lesson learned.
At the end of the day, even though I may be an avid gamer, I acknowledge games are just games. Each one a passing fad until the next or better one comes out, and it's not like there isn't a life outside of gaming. On that note gaming now is considered a sub-culture, and clearly popular and has a lasting appeal in peoples' lives to keep them coming back, and is an entertaining pass time for both casual players and players on a competitive side (which usually plays a role in the evolution of a game).