Consumerist grandson inveigled and finagled his way into getting a Switch 2 for Christmas. Now he's drawing Plustikas over everything and says Treatler did nothing wrong. What do I do?

With a smirk he just says "oh, but that's just the Switch 2 Plus button." But I know. I know what he's up to. This is what gaming does to children? I tried engaging with him intellectually by debunking him and the Consumption Demon Treatler in front of the entire family but they all said it wasn't good nor dialectical grandparenting. I said he was allowed to debunk me back but they said "he's seven" as if that's an argument.