We haven't implemented such feature because that kind of behavior is pretty rare.
One or twice a month, we've got some butthurt trolls from the other place who come and try to drive users away. The almost immediately get caught by the algorithm and are leaving after posting a few insulting salty comments and realize that no one cares.
Thanks. It is far to easy for people to become trolls online. It is also easy for pure text to be read in a completely different tone than the writer intended; I noticed this a long time ago, when I read what I perceived as a nasty note, from a normally very sweet lady.
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