ah yes that lone chuuni boy strikes again

"Chuunibyou (中二病 / 厨二病), often shortened to chuuni or chuu2, is an often-derisive Japanese slang term for the embarrassing behavior of 13-to-14-year-olds. The term literally means "Middle [School] 2[nd Year] Syndrome" (often translated as "Eighth-Grader Syndrome" in US media). Despite the name, it can manifest in people of all ages."