You forgot one important thing,
"People" as you call it here, don't have any manners at all, it's not like in real life,
The behaviour here is at the level of apes / animals, hence the question why anyone serious should take it seriously?
Just a simple rhetorical question.
Welcome to the web 2.0.
Read this for further explanation:
https://gfy.com/fucking-around-and-business-discussion/892286-web-2-0-phenomenon-idiots-getting-exposed.html