It is true, though. Especially when you're younger. As a kid, you will naturally gravitate towards characters who look like you for reliability (This doesn't mean that they are their favorite character, simply they're more invested in the story).
As an adult, you become more privy to how the system works, how Hollywood works, how stories and demographics work, so it's very hard for that genuine gravitation to exist in the same capacity. You've been exposed to so many movies or games or TV shows, you just start to think, "I want something good to watch". But that just means when a war game comes out and features like, a black chick, you're very aware of it because it's so different from the two decades of thing you're used to.
It's like when a cartoon comes out now-a-days and it doesn't feature bean mouth with round teeth, people praise the heavens because it's something different. And if that different thing also coincides with something that has built in your subconscious since you were a child (IE: "All the create-a-characters in video games were white, which felt weird to self insert into because I'm black and wanted to make my avatar black"), then it becomes extra special. At least for one moment.