People are a lot more critical about the other rules, the curfews, the ban on outdoor dining and bars and the closure of sports facilities. And the ‘you can’t have more than one person over’ rule is generally ignored.
By the way the official Dutch position still is that surface transmission is significant and one of the three ‘main rules’ is to wash your hands a lot.
Because Donald Trump wanted to downplay the potential scale of the pandemic, believing it distracted from his narrative of economic success playing into his re-election, so he attributed reporting on the pandemic to a "Democratic hoax," feeding into right-wing mistrust of the motives behind both mainstream media reportage and legal measures like lockdowns, which many considered unconstitutional and a pretext for installing a leftist police state.
Also because Trump refused to wear a mask publicly, considering it a display of weakness in front of the "liberal media" which he considered to be the enemy, and would often ridicule people who did wear a mask.
As a result, among Trump supporting Republicans, wearing a mask became associated with sheep-like submission to "leftist' (read: Democratic) authoritarianism, and not wearing a mask became a display of defiance along with the MAGA caps.
It is impossible to consider the phenomenon of the way masks are perceived in the US today outside of the context of the atmosphere of deep paranoia, polarization, mistrust of the press and "international" organizations created by the Trump administration, or the effect of conspiracy theories and misinformation spread across social media by QAnon and Trump supporters.
Seriously. I have explained this many times to my European friends. It is difficult to appreciate how people here will always want to push their own personal freedom of choice out as far as they can no matter how much someone else suffers.