Bitch+Vitriol=Bitriol or even Bitchriol. (*Bitch as in complain)
When someone is complaining and bitching but with a lot of nastiness & vitriol (*Vitriol=bitterly harsh or caustic language or criticism(Merriam).
It’s taking complaining to a new level as the complaint or criticism is laced with a harsh nastiness and vitriol.
‘There’s so much Bitriol on social media nowadays, that having a civil discussion is not even possible!’
‘Damn she’s Bitriolic. Watch yourself!’’
“You’re so full of Bitriol!’