The rabbi is correct in his assessment in following the words of G-d in the Torah, which is the job he is being paid to do. Therefore allow him free speech. Furthermore, when one looks upon the accompanying photo, one is reminded of a scene in Sodom, and the wise words, "Pride comes before a fall".
Nusra Front in Syria says it has detained U.S.-trained rebels (Reuters)
from the article: Ra'anana chief rabbi: Participants in gay pride parade poison the public