They're prone to spamming you with "cute", primarily MLP pictures
You try to discuss issues going on in popular posts
They fret and pout like a child just because you did that saying shit like "Why don't I just go not exist?"
You curb the idiocy by "spamming" them with realistic facts (because they love spamming you with clever scientific loopholes because "hurr durr")
Then you spam them with pictures (like they do to you). Particularly, realistic pictures
They make an asinine comment on you in regards to one of your pictures meant to say "You have a bleeding anus"
You ignore, and keep spamming pictures
Somewhere in between, you mention that the only reason they're upset is because the pictures you're linking them to, quote, "aren't cute enough". They reply with "Bingo!".
They make another asinine remark on a game screenshot meant to say "You have no class", then they repeatedly spam you with the same picture of a "Stop" sign
You link them to the wikipedia definition of "infantility", and log off to go do important things. You log back on, and they've posted a link to something meant to mock one of the characters in your story writing
They mockingly say they've blocked you. They haven't. Then they say "lol" with a raspberry face emote

I then blocked all contact with them. Clearly, I was dealing with an unbearable manchild......who just so happens to be 28 years old.

This is what I get for making concessions for this person when another friend of mine was smart enough to drop them over 4 years ago.

I literally lost a friend because they can't handle staring at anything that isn't excrutiatingly cute. This is where we are in the year 2016. There are moronic manchildren everywhere you look.