I'd have no problem dating someone with a different political view - so long as they were capable of discussing things civilly. But that's the problem these days, so many people aren't. Instead, there's a lot of people who are sanctimonious and preachy and only believe their view is the correct way of looking at the world, and if you think differently, it automatically makes you a bad person.
I've voted Conservatives most my life, and I'd describe myself as being moderate/centre right. I'm not far right by any means (I dislike the far right wing head bangers like Truss, Braverman and co), and I'm freely happy to admit that the Conservatives have got a lot wrong, particularly since the last GE.
But I've encountered it before, people who I get on fine with me otherwise completely change when they discover my political affiliation and have to launch into a massive lecture as to why I'm wrong to think that way, even though I didn't ask for it.
Personally, the people who make politics their whole personality is a bigger red flag to me than someone who might have a different political opinion.