Reply #148: FINALLY an actual question and no straw! BRAVO!

[Behind the Aegis]

"legitimate criticism of Israel" -- criticizing actual policies, politicians, or positions held.

"anti-Israel bigotry" -- singling out Israel for things other nations do at the same or greater ratio; utilizing hyperbolic propaganda; spreading lies/falsehoods/untruths about Israel even when facts do not sustain such allegations; expecting behavior above and beyond all other parties; singling out Israel for contempt; finding most, if not all things Israeli to be evil, bad, or unjust; using anti-Semitic canards under the guise of criticizing Israel; singling out Israel for special contempt

As with most bigotry, it is not a singular event or expression, but a collection of repeated actions demonstrating overt bias against Israel.