Right, this is where the conversation breaks down because I'm trying to apply my ideology to a system that is totally different from mine.
My centrism is based around UK politics. Left and Right don't practically mean the same in the UK as they do in America. In America, 'centre' means somewhere in the middle of GOP and Dems, but in UK terms centre pretty much aligns with the Dems.
I'm not as well versed in US politics because I don't live there, but generally speaking, I'm not going to agree with the GOP about much, because they occupy the right and aren't interested about centrist politics at all. On the inverse, I'm going to find myself agreeing with the Dems about a lot of things, because they generally occupy the centre. There's even a few things I'd go further left on than the Dems, because in UK terms they can creep to centre-right. For instance, I support public healthcare, but most Dems don't, so on that issue, I'm further left than the Dems. But generally speaking I'm going to agree with them on most things.
In the UK, most people are pretty much centre with small leanings, so is it any surprise that most Brits support the Democrats and a very large number of people here, even more right-leaning ones, hate Trump? All of our parties are pretty much centre with some sort of leaning, e.g. tories are centre-right, libs are centre (although I hate the libs with a passion), labour is centre to centre-left, and so on. The actual right and left wing parties are considered too extreme by most people, and is largely why, among other things, the labour party under Corbyn performed so badly. To a lot of people in this country, Trump and the GOP look more like modern UKIP than our tories, and dems look more like our tories than our labour.
So actually, my point still stands.