The churches that have been built since were built by denominations that place less value in visual and architectural art than, for example, the Catholic or Orthodox churches. The single Catholic church in my town does look nicer than the others, although the inside looks just as fake as everything built since the 1950s.
I have visited the church at Rota and the cathedral at Càdiz, and they are beautiful. We do not have churches like these where I live. But it wouldn't matter if we did. It is neither the blandness of my churches or the beauty of yours that cause me to dislike the church, but the way the church is used to spread hate for people who are different than them.
I am not religious at all, but disliking the church because it speads hate is like disliking white persons (or whichever arbitrary criterium you want) because they are criminals: the reality is that only a minority speads hate and only a minority are criminals. A majority of religious people are good and want to do good. And it doesn't require religion to spread hate, far from it.
It differs from church to church, of course, and it says nothing about any particular member of the congregation.
There isn't anything to hate about the architecture that wouldn't also apply to most public buildings built in the last half century.