I'm not sure about "shrill overreactions". Depends what you decide to call "trivial" - it's subjective.
That's my point - people fail to recognise their values are subjective (all values are) and can't tolerate others having different values. Such people often overreact to others who don't conform to their values.
By trivial I mean person-X makes an offhand remark, not-targeted at anyone ...
By shrill I mean a large group of people claim to be grievously offended and all pile into person-X on social media or in the press and take offence. The harm done by the bullying and mob-rule inherent in the reaction exponentially outweighs the initial 'offence'
As an example: A mate of mine pointed out on Twitter, that a pay gap report published by the MoW in 2017 actually showed that the standard deviations of male' and females' pay rates overlapped (i.e. at first glance there is no gap). He got lambasted. People from all over the world who didn't know him form Adam and some prominent NZrs were piling in - not to attack his reasoning, but to attack him. Mostly by calling him misogynist and/or sexist (he is neither), but also with some really nasty personal stuff.