To be fair I'm certain we both have issues this this bubble echo chambers that are springing up on all sides at the moment. I have seen groups of my friends just gloss over issues that they had lambasted their hated opposition for. And of course if you bring it up your the arsehole.
I think with reddit it is so hit and miss. With them being niche there is the bubble mentality. r/tankporn is pretty chill and just cares about tanks. But r/EDC, boy you had better not question why an IT tech needs to have three pen knifes, a hand gun, a back up hand gun and a can of mace. Its very heavy on the old 2nd front. Its so hard to tell without getting in on them. Hell half the time you will get a straighter answer from the pit that is r/japancirclejerk then you would from r/japan. In summation people are dicks no matter where.
In this case I think it was some butthurt weeb. Did piss him off when he tried to PM me about how I didn't understand the sanctity of Japan and I informed him I bloody well live there.
Edit; I also called him a knob goblin and a bum ferret. He has not replied. The former is a creature that lives under foreskin and the latter is a type of multi legged rodent that lives in the arses of particularly grimy individuals for those wondering on the entomology of English swears.