The ok thing has a bit of a meta origin.
It started on a sub reddit as an injoke where they tried to make up something ridiculous and get lazy journalists and Twitter activists to repeat it as fact.
Life began to imitate art because by it being repeated often or retweeted, the actual white power and alt right groups began to use it believing they were following a genuine trend from people who were of the same views as them.
So it was picked because it was so ridiculous that anyone reporting it could be mocked for believing for a second it could be true, and then it actually became true.