So make your friends somewhere other than the school gate? Which is just a random cross-section of people who have children aged between 4 and 11. Who are unlikely to be receptive to you fulminating about burning down the NHS, ‘crying wolf’ antisemitism, and the UK being ‘decadent’ and not offering ‘quality of life’ — have you noticed that everything you’ve listed as an ‘unpopular opinion’ is negative?
It may be less that people don’t agree with some or all than that they don’t want to stand listening to diatribes. It’s draining, like listening to Mad Malcolm from next door complaining about the buses not running on time and his gammy leg. Especially if, as your child says, you also make faces a lot.
If you feel strongly about these things, find a way of getting involved in activism, which may put you in the path of kindred spirits, or consider going to live elsewhere, if the UK makes you so vocally unhappy? Is there nothing good that you feel strongly positive about, for instance?
From your posts as a whole, it sounds as if you haven’t ever gone out looking for like-minded friends, and your negativity and inability to make initial small talk are putting off the few people you do meet. DH’s niece’s longtime boyfriend would say similar to you , but the real reason he has no friends is that he sees other people as there to be an audience for his self-congratulatory monologues. He has zero interest in anyone else.
I’ve moved a lot, and one of the first things I do anywhere new is look around me for ways to meet the kind of people I like. Obviously sometimes you’re disappointed, or someone you like isn’t interested, and some places are richer than others in terms of potential friends, but if you want fruends, you will have to put more effort into it, and be more interested in others, rather than complaining about ‘masking’.