@Hekatestorch
No one hypothesised anything. They stated it was peoples anxiety. Not theory. They stated it as though it was fact. The poster the agreed with it
You’re wrong, the post started as ‘I don’t believe’. So it’s an opinion.
Some people are less sensitive than others, or not sensitive in this way at all.
A lack of sensitivity to picking up bad vibes, is not sneery. If the person could pick them up, they would believe them.
Except she didn’t say ‘a lack of sensitivity to picking up bad vibes’, she said ‘a distinct lack of sensitivity’. 
And to be fair, how can someone complain about being sneered at, when they came out of nowhere, just to sneer at people themselves or to support that sneering?
You’re really reaching here. She agreed with someone, that’s not sneering.