The Brief: "Read for filth" means to harshly criticize someone to the furthest extent.
“Read for filth,” sometimes quoted as “read to filth,” is a popular phrase meaning to harshly call someone out or lay into them. The phrase is normally used in a humorous manner.
According to Urban Dictionary, the phrase traces back to July 2016, but as of June 2020, it is seeing a resurgence in popular slang IRL and on the internet, most notably Twitter.
last time I was on Omegle I was read for filth and haven’t looked back sense
— SΔM 💬 (@High_Sodium_Sam) June 12, 2020
Out of the mouths of Canadians… we are getting READ for filth. https://t.co/yuNW2OMpeh
— Algebra Bassett 👨🏾🏫 (@_Shadecaster) June 15, 2020