Conservatism by definition is thinking “Things are good right now, let’s not change anything” or even worse: “Things were better before, let’s go back to that”.
The issue is “better for who”? Women, queer people, POC, working class people were NOT ok. Implicitly you can see that conservatism is bigoted by (at a minimum) ignoring or misrepresenting the realities of people they don’t care about. It’s just that lately, more and more conservatives are explicit about it and showing their true colors, but the philosophical underpinnings are the same.