Jealousy in the air tonight, I could tell
I will never understand that but oh, well

from Drake – The Language Lyrics on Rap Genius

Meaning

A lot of people and peers hate on Drake and his music, most of them with no apparent reason so they just go and find the most little or stupidest things to try to make fun of him.

Also could be referring to the jealousy in the air when he goes out to party and people just get jealous at all his things and women and glamour, etc.

He will never understand why they hate on his success instead those people could go and work as hard as him to get theirs, but like he said: oh well.

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