Green Day frontman Billie Joe Armstrong has branded Korean rapper Psy as "the herpes of music."
Armstrong made the comment on his Instagram account where he posted a picture of the "Gangnam Style" singer and said: "This dude is the herpes of music. Once you think it's gone, it comes back. #herpes #flareup #pleasegoaway."
We're guessing Armstrong wasn't a fan of Psy's comeback single "Gentleman" which earned 20 million views on its first day. The official video currently has over 300 million views, but has been banned in his native South Korea for a scene where he kicks a "no parking" sign.
Psy was told about Armstrong's comments on the Fuse show, but didn't know what herpes meant. When the presenter explained, Psy made every effort to remain a gentleman: "I think it's really cool [what you said], and I appreciate that. Thank you."
Meanwhile, Green Day returned to the stage in March for the first time since Armstrong's on-stage rant which was his last public appearance before spending some months in rehab.
Watch Psy's reaction to being called "the herpes of music" here:
What do you think of Psy? Will he fade away, or remain a superstar template of online celebrities? Let us know what you think in the comments.