So muzan after turning kakushibo went to yoriichi to gloat only to find out that yoriichi could kill his ass. My hypothesis is after this the world became a little bit peacefull with muzan heavily injured and that's why people start not believing demons.
Wow. What a nice change of pace. Usually it would be like haha you reach rock bottom or don't ever appear before me again or the mc would usually just ignore them. But this manga didn't do that.
I really hate how those princes are selfish assholes. They only care about themselves and not care about others. Julian said here that one sided love isn't love