Knicks' James Dolan Banned Heckler In 2018 for Saying, 'Sell the Team'

[[tmz:video id="1_sdpldy7g"]] Another NY Knicks fan claims James Dolan banned him FOR LIFE from Knicks games for telling the owner to "sell the team" in 2018 ... and TMZ Sports has the stay away document to prove it!!! The guy we spoke with is…