I would have a 1:1 conversation with the CEO or CTO. Ask them if this meeting matches what they expect the culture of the company to be like. Express that it do

I would have a 1:1 conversation with the CEO or CTO. Ask them if this meeting matches what they expect the culture of the company to be like. Express that it doesn't really match how you like to work. Your goal is that once you leave everyone says "It just wasn't a good fit" as many times as possible, because that's what lets them still recommend you to their friends. And yes, you should feel free to leave.