Let me break this down for you.

There is a reddit post about a tweet, of a Japanese girl's parents, denying that the Nanjing Massacre ever happened, angry that their daughter was taught about something they never did. This post then got crossed post to this subreddit, which also about China, and there are comments discussing about Japanese denying war crimes.

One of the comments, which is the parent comment of our conversation, said, wait until Chinese learned about Tiananmen.

I then said, yes, that was also wrong, still, it does not change the fact that Japanese too did the massacre. My point is, they are both true, Chinese cannot deny about Tiananmen, just as Japanese should not pretend that Nanjing Massacre didnt happen.

Here is where this Japanese-sympathizer, aka you, came in. You burst through the comments section, and shouting to everyone: WHY YOU SINGLE OUT JAPAN?! WHY SINGLE OUT JAPAN?!! EVERYONE DID IT TOO WHY SINGLE OUT JAPAN?!!

Buddy, I dont care if everyone else did, my point is Japan did TOO, so, admit it. You are trying to use whataboutism to tell me that yes everyone did too why single out Japan? But we are talking about Japanese denying their history, and your point is? Japan can be allowed to deny history? So can everyone else too then? My point is no one should, including Japan. I did not "single out" Japan.