It's just live and let live and be generous. D&D players profit from a huge player-base and tons of public recognition. So I think you can't begrudge us others to occassionally grumble "yeah, well, everyone's always talking about D&D, why won't play anyone Tales of the Bamboo Toothbrush Knight with me? It's just so much cooler."
To a certain extent, that's true in almost everything.
For example, if you live in America, you know that if you like sports, you're going to have a lot more support if your favorite sport is the NFL. You can watch the games, you can watch people talk about it endlessly, you can gamble on it, you can talk to almost anyone about it, you can play fantasy leagues with your friends, and so on.
If, on the other hand, you're into F1, you have less support.
If you're into D3 college football, even less support.
If you're into Serie C, even less support.
If you're into high school cross-country running, even less support.
If you're into World Croquet Federation matches, even less support.
...and so on. That doesn't make any sports better, or worse, but you're probably going to find that there's a more robust ecosystem around the NFL, and you'll have to put in extra work to get people to join you in watching (and following, and talking about) lesser-known sports.
(Of course, one saving grace is the internet- it's always easier to find people remotely due to the ability to find people from a much larger pool.)