If there's one thing we've learned from following the One Direction guys on Twitter, it's that they're not afraid to strike back when people get a little too sassy.
And of course, we're not referring to fans. No, no – the times the 1D boys got most heated were when they got into a war of words with other famous stars. Harry Styles, Niall Horan, Liam Payne, Louis Tomlinson and their former bandmate Zayn Malik have all had their fair share of social media feuds, and we are breaking them all down for you.
We know what you're thinking – some of the One Direction cuties are more likely to get into social media wars than others. Like who in their right mind could ever start a fight with Nialler's kind, genuine soul? However, he did have a little awkward exchange of tweets after he trash talked a professional rugby player's attitude. But hey, he was just making an observation.
Click through the gallery to see all the heated times the One Direction guys got into serious fights on Twitter.
This post was originally published on June 7, 2016 and since has been updated.