By shade, we do not mean the opposite of highlight. Shade is a term for being harsh or disrespectful about someone, or giving someone attitude. Shade can also be used to describe a particularly heated argument or event.
Example 1: When two celebs are having a Twitter war, you’d say:
“Did y’all see that shade on Twitter yesterday?”
Example 2: When your friend looks your outfit up and down and disses your new shoes.
“Girl, why you throwing shade at me?”