No idea if we're thinking of the same instances, but I've noticed a few times recently posters who post an opinion along with reasons for that opinion, and the reasons are demonstrably false or at best misleading, and when others point out that they're using false premises in support of their opinions, they retreat to "it's just my opinion, I should be allowed to have an opinion" sort of thing. It would help if people could remember that on a public discussion forum, if you post your opinion, it's likely to be discussed. Publicly.