You should maybe read the "controversies" section of his wiki page.
So Justin is feeling a little picked on right now. With the gleeful response to his arrest, he's probably feeling like big stars always have people trying to tear them down and stuff. So he just posted something on Instagram that compares himself to one of those super-talented, picked-on, perhaps unfairly maligned celebs:
Whoah! No! No, no no, kiddo.
First of all, let's deal with the ego thing. Talent-wise, you're not Michael Jackson. Michael Jackson sang songs when he was 12 that are still considered classics today. No one over the age of 12 even knows a single song of yours. Michael Jackson could float off the ground when he danced. Your signature dance move is to do that beating heart thing with your fingers.