Edit 2: I was originally really bothered by the "I still voted" thing due to the Democrats having literally been the vanguard of widespread socially-acceptable COVID denialism, but I read the OOP again (after discussing with JoeByeThen in this thread) and it's really understandable, actually. I think the OOP isn't extremely politically aware, but they are pointing out a real issue here. The left should be the vanguard of pushing back against this, but today it's mostly a small portion of the left while the majority has adopted the liberal position completely on this issue.

The linked thread is mostly garbage for the simple reason that many of the people in it clearly don't know what "left" means, so it's an eclectic mix of vague but mostly correct critiques of leftist groups and people who are talking about the Democrats (including likely OOP, who defensively assures commenters "they still voted").

Edit: elsewhere in the thread, OP says "Leftists consider liberals as very non-serious", so it certainly seems like OP is a radlib and not a leftist. As purpleworm pointed out, very suspicious to title the thread "any leftists" instead of "non-masking leftists" or something similar.