Well, they could also dial down the weird during an interview, and slowly reveal their more personal side as they get to know their co-workers better. This seems so obvious it's barely worth stating, but it seems like there's a false dichotomy in their post (no weird XOR weird).

I mean, everyone is weird when you look really close. But we can be cool with one another. To me it just sounds like they're still quite sensitive to judgement, and looking for explanations as to the rejection. I totally get that, I'm in the same boat. Sometimes you just don't have a good explanation, and you have to solicit valuable feedback elsewhere.