Click to email a link to a friend (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)This feud has come to a head. Elon Musk stooped to a new low Sunday as he challenged Mark Zuckerberg to a “d–k measuring contest” in a bizarre tweet. But Musk’s latest posts were the final straw for some longtime Twitter users who have considered ditching the established social media platform for its promising new competitor. Elon Musk challenged Mark Zuckerberg to a “d–k measuring contest.” AFP via Getty ImagesZuckerberg launched Twitter rival Threads on July 5. dpa/picture alliance via Getty I“This is getting out of hand,” one person wrote. Others called out Musk’s “middle school behavior” and branded his penis-comparing diatribe “embarrassing” and “corny.”Twitter sent a legal threat to Threads after the new app’s launch.