Do most Americans think Koreans are amazing singers and dancers since they are obsessed with K-pop?

I think it's generally based on the Koreans that I personally know. Most of the ones that I've met are very shy and none of the Koreans in my high school or college were particularly good at music except orchestra. In all honesty, there are nerd stereotypes associated with Koreans which is why K-pop is good for your image. I was also frankly surprised that Dong from Unbreakable Kimmy Schmidt the romantic lead