I think you misunderstood what your instructor was telling you in class, and you're not alone... many agents believe what you just stated. However, the client is 100% allowed to tell us where he wants to live. And yes, we may supply the map (in fact our local Board prints a map with their logo on it, created by Rand McNally so there's no concern about where the map comes from).... and yes, the client is allowed, legally, to draw a line on the map, to indicate the area they want to live within.
You are correct, that WE should not draw the demarcations. And you are correct that WE cannot "steer" them into an area by saying "you should be within walking distance of a synagogue". However we are 100% totally allowed to follow those client directions when they TELL us that they "want to only look at houses within walking distance to a specific location"... even if that location is a synagogue.
Now... we are NOT allowed, if the clients asks, to show them only WHITE neighbourhoods, nor are we allowed to show them only JEWISH neighborhoods... because that would be a determination on our part as to what a white, or Jewish neighborhood actually is. But if the client shows us a map, and says "This is the area of the Jewish neighborhood that I want to live within", we ARE allowed to follow that instruction. I know this for a fact, because we do have a community in our area with a large Jewish population, and the scenario I mention has been tested and approved by the board.
The distinction is that WE are not the ones steering. The direction is coming from the client, and that does not qualify as steering.
And by the way, having a professional, calm, polite discussion (even when we disagree) about a real estate subject, does not qualify as "in-fighting" either. I respect your right to disagree with me... but please check your facts, because in this case you're giving incorrect (though widely believed) information.