There is absolutely NO evidence that 'the public' have a low view of teacher's unions and what the NEU may have said about eg behaviour strategies to teachers since the pandemic is irrelevant. The people who have a 'low view' of teachers' unions will almost certainly have a low view of all major unions, I'd bet.
Please don't base ideas of'public opinion' on some loud voices on MN. It's hardly a scientific approach.
Throughout Covid, the unions' role was to support the people they represented. They did not say more than half the stuff the Tory spin machine said they did and I am bemused as to why people are so gullible. Leaked whatsapps in fact reveal that MH himself said schools should shut in the January and was shouted down. He turned out to be correct that a U Turn would be inevitable.
People have selective memories. I fully remember driving to school on traffic free roads to teach students in classes of 30 when most of the public was still WFH. It was a surreal time to be crammed into schools (with masks and nothing else) and then on the way home no be able to shop normally, go to the GP in person, go to the pub, visit the cinema...