It's no secret that Donald Trump dislikes a lot of things. He makes it known on Twitter.

Last year, The New York Times compiled "the 319 people, places, and things Trump has insulted on Twitter" (though that number has grown since then). Among them were the paper of record itself, Hillary Clinton, the Tony-winning musical "Hamilton," 20-time Oscar-nominated actress Meryl Streep, and retail giants like Macy's and Amazon.

A group of anonymous activists have decided this makes him a bully. On March 16, they launched the "Block the Bully" campaign, and an application that automatically un-follows and blocks Trump on Twitter. Users can then choose to share the campaign with their Twitter followers, and explain why they did it.

Anyone can un-follow Trump at any time without an app. But "Block the Bully's" creators hope the effort will turn into a widespread movement.

"Of Trump’s 26 million Twitter followers, fewer than half actually voted for him. The majority are people like us — citizens who want to see what our president is up to and, candidly, can’t look away from what we perceive as the train wreck that his is presidency so far," they said in a press release. "But what if we did look away? What if tomorrow Donald Trump woke up and saw his following cut in half?"

Here's how "Block the Bully" works.