Thanks for the update, OP. It's interesting that the hosts are in their 80s! I find that somewhat reassuring. It doesn't excuse their views on Muslims, but maybe it explains why they are clueless enough to express those views so freely. I want to believe that the younger generation of French people are more tolerant. That said, most French people who vote for the Rassemblement national are probably not keen to advertise the fact. Praise be that the RN were defeated in the recent election... the majority of French people made it clear in a democratic vote that they did not want a racist party to be running their country.
Incidentally, I've also met some really sweet elderly neighbours in the UK who shocked me by matter-of-factly expressing their racist views, so this kind of phenomenon is not exclusively confined to France.😥
There are multiple aspects of French law that I don't agree with, including the fact that burkha wearing is banned in public, the fact that secondary school students aren't allowed to wear the hijab, and the fact that the government doesn't keep track of data about race and ethnicity. But this Airbnb host has gone much further with his racism, by seemingly refusing to host Muslims at all.
I do think there's a big difference between countries like Iran, which is governed by a theocracy and condones numerous human rights violations, and a country like France, which claims to be a liberal democracy and a state that respects human rights. In the case of France, you can argue that when the government discriminates against Muslims, it's hypocrisy, because they're not living up to their own democratic ideals. Whereas I'm not sure that the current government of Iran claims to adhere to democracy in the first place. That doesn't mean that the discriminatory practices in France are OK (far from it!) but I hope that there is potential for democratic change, as there is in the UK.