Yep, that line made me see red, too.  First, no, you are not better at designing them than playing them.  Second, you're just admitting you don't spend any real amount of time playing games. You pick one up, probably at your local game store where you act like a total bitch the instant you arrive because you expect all those evil white males to give you shit. To counter this, you loudly talk about how you're a "female gamer" as you walk through the store, expecting those few men who aren't mean to you to be in awe of you because you think you're the only chick who's ever walked in there to buy a game (you like to claim half of all gamers are women, but let's be honest--you secretly believe, in your heart of hearts, that you are the Only Gay In This Village and that that should make you special, and that everyone should treat you as special).  I don't play games online or do co-op, personally, because I don't have any real "gaming" friends to play with and I'm not familiar enough with how it works/confident enough to want to play with strangers. But that doesn't mean I don't think I'm any good at playing games in general; I am pretty good, and I know I'm pretty good, because I play enough to become pretty good. It's not hard. It just takes practice, and you practice because you enjoy it.