a. harsh or corrosive in tone; sarcastic; bitterly scathing
Any time that a simple request for evidence results in vitriolic personal attacks, or an attempt to censor, with no attempt to address the issue.
Sentence in Classic:
We walked along the North Strand Road till we came to the Vitriol Works and then turned to the right along the Wharf Road.
It seems that you Europeans have only milk in your veins; but it is vitriol, it is fire which runs in those of the inhabitants of Mount Atlas and the neighbouring countries.