Imo the average person's view of the pandemic was/is mostly shaped by government propaganda, first that COVID was a threat to take seriously and later that COVID was over. If the government were broadcasting "hey by the way 50% of people who contract COVID experience symptoms past 18 months", I imagine we'd see less dipshits pretending it's not real.
That said, there's definitely an element of individual stubbornness. Most liberals I talked to just before mask requirements were removed would try to say some bullshit statement like "WELL WE CAN'T LIVE LIKE THIS FOREVER!", but when pressed on the fact that their lives weren't actually interrupted anymore with schools, workplaces, restaurants etc already open again, they would bashfully admit that they just didn't like wearing masks. At any rate, I certainly wouldn't lose any sleep if the people in my life who refuse to mask or test drowned in their own lung fluid tomorrow.