Doesn’t surprise me, leftist sites and people in my experience only want to believe what they are told by these central sources such as politifact. The right is guilty of it as well but it has been a bit more obnoxious on the left because they feel they are educated and if there is something that is against their beliefs it is inherently wrong, educated people can’t be wrong.
Polarization like this will be the end of their platform, in my opinion. It’s been failing for a while but this will speed up the process.