is it normal to be defensive about kpop idols?

so I recently started hanging out with this group of friends who are really into kpop, I wasn't that into it before then but since we've been friends ive started to get into it as well so we would have similar interests. I'm not all familiar with it but I know a few terms like 'bias', 'ult', 'photocards' etc. im not that familiar with all the groups but I have one friends who really likes a certain group (I forget which one) but she showed me pictures of some of them and asked me to choose, she also said that there were two wrong answers (which were the other two friends' biases); I thought it was a bit weird but I just ignored it. a week ago, there was another instance kind of like this, they made me watch to music videos of this group enhypen and I thought that one of the members was really cute, I asked about him and my friend started to say things like "no he's my bias so he can't be your bias". another friend in my friend group also likes that one member and they constantly get into arguments because "hes this friends bias so he can't be someone else's bias" and weird things like that. are a lot of kpop fans like this? I don't want to get into it that much if I get hate for simply liking a person.