My assumption is that you are referring to points D and F from the BBS TOS:
"D. Chronic expressions of direct abuse toward another user will not be tolerated. Users are encouraged to debate, argue, and even insult, but repeated harassment will not be tolerated. The determination of the word “Chronic” shall be left to the discretion of the moderators.
*Snip*
F. Chronic expressions of direct abuse toward a collective ethnic group of people will not be tolerated. If you collectivize a group of people by their genotype and make directly negative comments about said group you are treading thin ice. The determination of the words “Ethnic group” and “Chronic” shall be left to the discretion of the moderators."
The answer to your question is this: Don't be a giant douche to other people on the board. If you do it, mods may eventually get involved. "shall be left to the discretion of the moderators." is as clear for you as it's gonna get.
Having said that the tolerance level of the mods and super fucking high. Some users a while back went after some crazy screaming troll user for weeks before anyone did anything about it. What was done was that the crazy screaming troll user was banned and the other users were told to knock off baiting the crazy.
Generally, if you start advocating racist bullshit or harassing another user, (The phrase "shall be left to the discretion of the moderators." should be kept in mind at all times.) someone will eventually take notice and say something. Probably a few times. Then they'll probably temp ban you. If you keep acting like an asshole, they'll ban you harder.
Also, none of the mods (Unless they're bored or interested) are likely to have a debate about definitions of terms and picking apart the TOS word by word like a first year law student. I'm certainly not gonna and I wrote the current version of the TOS.
In the immortal words of Will Smith - "Don't start nuthin', won't be nuthin'."