Here are a few guidelines for proper decorum on public discussion boards:
1) Ad hominem comments — attacking the person rather than the argument — is not only forbidden, but invalidates one’s entire statement, even if parts are factually correct.
Condensed from wiki: “Abusive ad hominem (also called personal abuse or personal attacks) usually involves insulting or belittling one’s opponents in order to attack their claims or invalidate their arguments, but can also involve pointing out true character flaws or actions that are irrelevant to the opponent’s argument. This is logically fallacious because it relates to the opponent’s personal character, which has nothing to do with the logical merit of the opponent’s argument.”
2) Also related to ad hominem comments are hate comments targeting a person’s sexual orientation or gender identity. Discussion or questioning of a person’s gender identity or “outing” is considered hate commentary and is a form of transphobia, even if the person doing the “outing” is LGBT themselves.
3) And finally, preaching is NEVER appropriate. Likewise with Bible quoting. One doesn’t get to be selfish and inflict their views on other people on public discussion boards.