Roblox is significantly older than Minecraft (2006 vs. 2009/2011 depending on where you start counting) so the optimistic part of me thinks people won't talk about Roblox like that.
Lemmy often assumes the worst about comments. I think people interpreted* your comment as "can you imagine this woman I know enjoys this kiddy game?!". While you really meant, I think, "some adults like to play Fortnite, too, actually".
I join my boomer squad nearly every night. I'm the youngest at age 43.
We win 1 in every 4 games, so that's not awful. Depending on the mood we w-key or we just have fun and giggles.
It is a very well made game with fun mechanics and plenty of content.