don't knock it till you've try it

don't knock it till you've try it

Don't criticize or judge something that you have not personally tried or experienced. Don't knock it till you try it, man. Cold pizza is the breakfast of champions. A: "Yuck, you dip your French fries in mayonnaise?" B: "Hey, don't knock it till you try it!"
See also: knock, till, try
Farlex Dictionary of Idioms.
See also:
  • Don’t make a federal case out of it!
  • all in (one's) head
  • don't bet on it
  • don't get me wrong
  • don't beat a dead horse
  • don't cry before you are hurt
  • a thing you don't want is dear at any price
  • don't count your chickens
  • come it