Well, maybe the GM would enjoy something else more ... (BTW, it seems pretty typical that the "GM type" has lots of games they would like to unleash on their group, but most in the group just want to keep playing their dwarf druid.)
Sometimes, everyone can get on the same page, sometimes they don't ... I guess the thing here is that if D&D has already set the expectations, you will always feel on the defense when you want to try something else. And that can be frustrating ... I mean, why do some people always have to compare other RPGs with D&D? Why can't they just try them out on their own terms and see if they like them?
(of course, the problem is not D&D-exclusive; I played with someone who compared everything with Chronicles of Darkness, and all other RPGs always came up short for him.)
On the other hand, there's nothing wrong with sticking to what you like. But if one person is adamant about sticking to what they like, while the other person would like to try something else ... well, either one of them has to move, or they can't play together. And constantly having to move because so many people find even the notion confusing that you might want to play anything else then D&D can be, as I said, frustrating.