And yes, I am brainwashing him against all the corpo crowd.

Sounds more like you're deprogramming them.

The brainwashing is the Marketing and PR from the big corps that turns people into mindless consumers and even fans.

The overwhelming amounts of Advertising everywhere every day aren't there because people are naturaly prone to love brands, they're there to (mainly using techniques from Psychology) shift people's perception feelings about a brand to make them love the brand, and if you pay attention most of it is designed to influence people via their subconscious pathways (such as familiarization and associating the brand with other things they feel as positive) rather than to convince people with rational arguments via their conscious mind. So it's the Advertising that's using the same kind of technique as brainwashing.

If you're trying to change your kid's mind via convincing them of something (i.e. rationalizing with them) rather that through psychological trickery (for example, relentless pressure until they comply), then what you're doing is the very opposite of brainwashing.

If you can help it, you shouldn't. It promotes the games to a wider audience if they get views/likes/comments. Nintendo doesn't deserve that free marketing, and you engaging with it makes it more effective.

I watch maybe 5 minutes of any of those Nintendo game videos because after those 5 minutes it becomes incredibly stale and boring looking at the same bright colors and round shapes all the goddamn time.

Also the fact that almost all Nintendo games amount to what is essentially a fancy arcade game with not a lot of depth to them.