When someone is getting irrationally angry and venting this anger at a completely innocent third party on the internet.
This is a modern version of the classic English idiom "tilting at windmills" from Don Quixote. It first arose in a thread on twitter in February 2020 by the social media person responsible for Yorkshire Tea replying to someone berating them because a politician had shared a photograph of himself with Yorkshire Tea.
Sue, you're shouting at tea. Please do look after yourself and try to be kind to others. We're going to mute you now.
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