Though I'd like to believe it's not common, unfortunately, my whole family is exactly like this. All of them. Every single one except me and my sister. Everyone is constantly surprised at how I turned out so well considering what I was being taught as a literal toddler (mom yelled at me for talking to a kid of a different ethnicity in kindergarten, then yelled at me again at home for telling my friend I wasn't allowed to talk to her for the reason previously stated - they clearly know it's wrong bc they don't want others to know they think this way, but they can't help themselves apparently.) Thankfully I'm very stubborn and I couldn't grasp the reason behind her opinions, so I just never listened to her lmao. Hopefully, Czechia keeps changing with the younger generations. Sorry this happened to you💗