I think K-Pop is different from other Genres (in so much as you can call k-pop a genre) in that there exists a culture where liking the artist is the norm. If he violates a social more, because fans become overly attached to the individual, it feels like a breach of trust and they would abandon said idol much as they would a friend who did the same (i.e. X idol plies guy with booze and sleeps with him while asleep). If I placed enough of my attention on the idols themselves, even then, I wouldn't care if they started dating. The odds of an idol from SK dating a non-celebrity from my country is small. The odds of my favorite idols secretly being of my same sexual orientation is even smaller. Therefore, I wouldn't really care..
Although, there were a group of fangirls who got really upset at some Exo event when they were asked about dating. But I firmly believe individual fangirls would not have an issue if Lay decided to date them (i.e. Taylor would hate if Lay started dating, but if he asked her out her opinion would all of a sudden change).