funny you are sharing this on MLP forums, it kinda reminds me the controversy that you bronies did "how can a grown man likes a show for little girls?" i personally think that as long as you don't hurt anything or anyone in any way you can do whatever you like. The people who have this kind of idea that a grown man can't enjoy games are the same kind of people that think that humans born, grow, work and die. It's called stereotype but they difference is something you put.
Your topic is nothing new really, society tells you that videogames are for kids and they don't see the potential that a game can give you. When you find someone who tells you that games are for kids only, tell them that games can teach you tons of things
-Improves awareness and skills to take decitions.
-Mixes perfectly art, fun, technology and challenges.
-For non english speakers it teachers you more than well language (i'm mexican and i owe videogames my english)
-Playing online helps you to meet new people and make new friends from all part of the world (heck, Who says videogames make you antisocial?)
-Almost nobody remark this but some videogames contains amazing stories that can make you cry (seriously when i saw THIS i couldn't help it)
Videogames are for everyone yes, and to resume all this there something called ratings like T, M, and AO