It's highly doubtful advanced aliens would see us as anything more than slightly more evolved animals. It would be like when Europeans started branching out and colonizing the lesser world. Half of us would likely wind up inadvertently dead after they made a pit stop for... whatever and then left. They'd probably take some of us pets/slaves/amusement but for the most part they wouldn't likely have much interest outside of idle curiosity/entertainment. There would likely be mass panic with dead people everywhere and attempted "war" against them and they would probably just find it funny/strange/bizarre/interesting to study.
We'd have an Intergalactic Clique and start doxxing these bastards.