mockery [laitzanus] is a violation of Torah Law, but surprisingly, the Coffee Room moderators permit it.
(Not that I think anyone cares; on the contrary, my decades of experience with “Frum” people have repeatedly taught me that nobody cares.)
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Babylonian Talmud, tractate Megillah, page 25B:
Rabbi Nachman taught: All mockery is forbidden, except mocking idol worship, which is permitted.
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Babylonian Talmud, tractate Avodah Zarah, page 18B:
Rabbi Elazar taught: Whoever mocks, sufferings come upon him…
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Babylonian Talmud, tractate Avodah Zarah, page 18B:
Rabbi Shimon ben Lakish taught: Whoever mocks, will fall into Gehinom.
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Babylonian Talmud, tractate Avodah Zarah, page 18B:
Rabbi Ketina taught: Whoever mocks, his wealth [literally, food] is decreased…
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Rabbeinu Yonah commentary on tractate Avot, chapter 3, paragraph 2:
Those who mock others, the Holy One Blessed Be He will mock them, and they will lose more than the people they mocked. And the humble persons who remain silent and tolerate them and they do not answer back, the Holy One Blessed Be He will give them grace [chein].
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Rabbi Yehuda Cahn said:
“…one who mocks others has a mean and defective character…”
SOURCE: Torah From Jerusalem Volume 2 (page 335), by Rabbi Yehuda Cahn, year 2002 CE, Baltimore, Maryland.
Rabbi Yehuda Cahn is a graduate of Ner Israel Rabbinical College in Baltimore.