OP the cooler heads on this thread are right.
At primary school what matters is that your DC attends a warm and supportive learning environment, looks forward to going to school each day, feels happy .. and learns the appropriate curriculum for Year 2. IMHO whether the teacher is called Mx or not is not very important in the greater scheme of things.
What matters much much more is how the school handles special needs and how the headteacher manages the school overall to be able to recruit and retain staff, make sure the teaching is delivered and so on.
My DC went to two primary schools. This is because I pulled them out halfway (as did a number of other parents) after headteacher mismanagement created an environment where there was huge staff turnover and they had a different teacher a term for two years, which had a bad effect on their learning environment. I would rather my DC had had a decent Mx teacher who stayed the year, rather than a series of white middle class heterosexual temps who didn't.
When I look back over my DC school career (primary and secondary) the best teachers that stood out to me were in many ways the least conforming to the "norm". One was "old" ie in her late 60s but didn't want to retire. One was a black gay man. One was a lesbian. In their own different ways they each created a space for my DC to thrive.
If there is another nearby good school you can make a realistic choice for, great, but most people don't have that option.
Why on earth would you put yourself through the pain of homeschooling?!
Dealing with your DH: certain straight men love blowing off about this sort of thing down the pub - as a sort of peacock display of their own heterosexual masculinity. But I would say to him in an act of diplomacy - "yes it's all a bit weird and modern isn't it, but shall we give it a try and see how it goes?" This sounds like what you have done already. He doesn't have to come to parents evening if it is too much for him - you can do that alone.
For the new qualified teacher themselves. I really hope they are not reading ... and in a way I also hope they are ... because they are going to have to find a way to deal with a lot of the types of uncertainty, prejudice etc in the coming years. The headteacher has made their stand by hiring them in the first place and now needs to find a way to back them, to allow good education to be delivered and not be derailed by (some) parent attitudes. IMHO the best thing this teacher can do is to deliver a great job of teaching and a smiling happy class at the end of each day.
Hope you work out a solution that works for you and your DC, OP.