Not gonna take that lying down, Eichner responded with this quip.
Which prompted the faux feud to continue.
Things got really real, though, when Eichner dropped this bombshell.
Luckily, Stamos is a good sport, retweeting Eichner's response with this image.
This isn't the first time the guys have yanked each other's chains. (Do people still say that?) They had this moment in May.
And Eichner even played hard to get with Stamos back in February.
Although it's clear they're just kidding around, it's still fun to watch them metaphorically duke it out on Twitter. Stay swole, guys!