It is a simple concept and so many seem to unable to wrap their minds around it. Human beings deserve a certain basic level of dignity and respect. Beliefs have no feelings and, in the public marketplace of ideas, they are not automatically entitled to respect. Ideas/beliefs may accrue respect as evidence mounts showing them to be good ideas. However, at all times, ideas and beliefs are, and rightly should be, subject to criticism and questioning. I would argue it is more than a point, it is the point.
It is not even that subtle of an argument. In most situations, when encountering a human being, assume they are deserving of basic kindness. If their are ideas are hateful or stupid, feel free to ignore those ideas or challenge them as conditions permit. While challenging ideas, make every reasonable effort to maintain the previously mentioned human dignity. If your efforts fall upon deaf ears remove yourself from that person's company. This should take care of 99.9% of the situations one usually encounters.