Other people can't tolerate overly-polite, overly-cautious, overly-friendly, overly-political-aware, overly-PC tone.
It makes us droozy and keeps the discussion in a level better suited for enterprise brainstorming meetings and committees. Everybody looses.
Tech and science leaders where very frequently passionate and prone to rant. Just think of Torvalds reactions to (what he thinks are) stupid ideas in the kernel list -- even if he's wrong, it helps keep everybody vigilant and agitated for his contributions.
>If we want computing to be a friendly and welcoming field and contribute to the betterment of humanity, we can't tolerate people who behave like this in public.
The aim is not to make computing a "friendly and welcoming field" (that would be the boy scouts), it's to make it an effective, productive and interesting to work in field.
If you start judging contributions to a field by politeness of "behavior in public" then you're doing the field a disfavor.
The biggest scientist in some field could as well be a huge jerkoff -- for example, Djikstra was known for his passionate rants and snarky tone against everything he considered a bad practice.