Lmao, I mean regardless of your decision based on it, if you seriously say you don't know the issues with Facebook you are either completely oblivious to anything happening in the world at large or you're just full of shit. Honestly, I just can't see any in-between in that scenario considering how FB has operated over the years in broad daylight and so much of their crap has been dredged up in very public ways over the last few years lol.
Anyway, to answer the OP, I think it's a combination of things. As many have already said, Facebook is one thing obviously, but I just get the impression VR isn't a big thing here. Maybe an unpopular opinion on my part, I also think there's a group of people who really make discussion about anything VR-related pretty unpleasant. I've had my opinion belittled and have more or less been harassed because I've said I'm not huge into VR in other topics with all kinds of elitist nonsense thrown at me. I think most of them are on my ignore list now, but it still largely put me off any potential discussions about VR I may find interesting even if I don't care much for the tech. I know I'm not alone in that experience, either. So a combo of a company that's hated by many, lack of interest and a somewhat hostile community (or at least some very hostile within that community) kind of will stop any big discussions or hype.