I agree the average person responds to unusual behavior with the same innate revulsion we fee to a physical deformity (perhaps to a lesser degree). However I think both revulsions do dissipate with time.
I think what doesn't dissipate, is the distaste for when somebody doesn't follow important and healthy social codes. For example, there's a stereotype of "nerds" pedantically interrupting everybody to correct minor or irrelevant details ("um actually..."). Now, stereotype aside, this type of behavior is genuinely offputting and counterproductive.
To a large extent I think "coolness" is the ability to keep the conversation flowing when a potentially emotional topic gets invoked. The opposite is that person who has a certain trigger-word, where if it ever shows up in passing, derails the whole conversation on a 1-man tirade.
In summary, I find a lot of what makes a good conversational isn't following arbitrary norms of the era, but a strong empathy/understanding for the emotional effect of every topic and bouncing between those emotional states with grace.