IMHO there isn't a realistic "typical gamer stereotype" anymore
sure you can pick any of the past stereotypes and will find people like that, even many, but it's not "most" or even "a slim majority"
Games, and with that Steam, have spread through all of society and Steam is the most wide spread platform for it.
So whatever anecdotal data you have based on your local environments selection bias is probably not "overall representative", just a slice of one of the many many different kinds of people playing games bought from steam.
Unfortunately I usually meet gopnik and niño rata in Dota and CSGO and not typical young nerds from Seattle