Iman Shumpert

NY Knicks superstar Iman Shumpert is pissed ... claiming he's sick of people taking shots at him just because he's a celebrity -- and now he's dropped a brand new rap aimed squarely at his haters. TMZ Sports obtained the new track, called "#HowToHate" ... in which the 24-year-old goes into…

It's official ... NY Knicks star Iman Shumpert's in a full-on RELATIONSHIP with singer Teyana Taylor -- and TMZ Sports has the video proof. There had been rumors the two were hookin' up, but this week the two set the record straight -- hitting up "The Equalizer" premiere together in NYC ... with…