di·a·tribe 
/ˈdajəˌtraɪb/ noun
plural di·a·tribes /ˈdajəˌtraɪb/ noun [count] formal : an angry and usually long speech or piece of writing that strongly criticizes someone or something
▪ The article is a diatribe against mainstream media. ▪ a bitter diatribe about/on how unfair the tax system is
▪ The article is a diatribe against mainstream media. ▪ a bitter diatribe about/on how unfair the tax system is
