Obviously, it isn't right to be rude to nurses but it probably also isn't right to sneer at people on their deathbed who don't want to accept that they're dying or really understand why, and blame them for their disease even though we have no idea how they got it.

I think some people dying in hospitals from COVID have a right to be mad at the medical system. Did these patients get any of the 5+ antiviral or immunomodulatory drugs with published successful RCTs? Did they get prophylactic antithrombotics? Did they get good advice on a healthy diet and medical care throughout their life? Probably not, and I don't think a judgmental tone towards them helps anything.