straight people really be like “haha let me spite my gf for an offhand boast she said and livestream the result” huh?

This has nothing to do with straight people, stop saying it

What exactly was keeping the GF from simply refusing and admitting she was wrong, and/or telling him to stop taking pictures?

Oh, wait, absolutely nothing.

This is normal teasing in a relationship, one time my gf and I talked big about eating a whole food tray of tiramisu to each other. Needless to say we both puss out when it came time to do it and had a good laugh.  

It is with a heavy heart that I must announce that the socially inept Tumblr users are at it again

a couple: [fucks around]

Tumblr: Is This An Abuse?