Surprized seeing extreme sir culture and weird hierarchy.

So i joined this org, i read about the traditional culture but I didnt expect it to be this weird. On Friday itself I was surprized to see this extreme bootlicking. It was awkward. My colleagues starts calling everyone sir then agree to whatever the manager says and again nod to everything plus they also do it outside. They dont even point out a flaw thats how bad it is. Although I am still learning as a new joinee but If I use first names they are like why are you acting oversmart and they also feel like I should be respecting like them. Hierarchy is insane and theres so much pressure to conform. In my last company I had a flat culture and this is a complete shift and its getting hard to cope up. The worst part is its so normalised and everyone here literally have no problem behaving like this.