I tend to support the perspective of Steve, if not in a more limited way.

While holding personal views that are harmful to others may be acceptable, promoting them (which is what is clearly the purpose, versus a search for enlightenment) is another matter.

It is the responsibility of those who see and know the difference (and the harm they do) to take these folks on and ensure these harmful views are not reinforced to ferment and grow in society. Holding their hands and encouraging such regressive views tends to reinforce their real motives.

That being said, politeness and logical and respectful discussion can surely be reciprocated with the same, as with the opposite approach.

However, if someone is promoting something that is disrespectful and harmful to others, respect runs short.