The Gay Pride Parade was established to educate the population that gays are people before anything else. The theme is always "we are gay and we are here". point finale. There is no reason to bring other political arguments to the table. If you want to push this Anti-Israeli agenda then pay for your own parade.
French tourist arrested for waving Israeli flag on Temple Mount (Haaretz)
from the article: Anti-Israel group could cost Toronto Gay Pride parade its funding