Listen to Jason Aldean on iHeartRadio | Listen to Zac Brown Band on iHeartRadio | Listen to Luke Bryan on iHeartRadio

Jason Aldean is showing that he's got Luke Bryan's back. 

Aldean is speaking out in defense of Bryan on Instagram, saying he's heard another artist is "bashing" his buddy's latest chart-topper.  Jason directs his post to "those people runnin their mouths" calling "That's My Kind Of Night" the "worst song they have ever heard." 

And he uses some choice language to say that nobody cares what the naysayers think.  Aldean adds that Bryan's song is "a big ol hit so apparently the fans love it which is what matters."  He gives a nod to Luke as well, telling him to "keep doin ur thing LB!!!!" 

While Aldean never calls out the basher by name, Zac Brown recently told a Vancouver radio station "That's My Kind Of Night" is "the worst song" he's ever heard. 

Zac explained that he likes Luke both as an artist and a friend, but he feels country music fans "deserve to have something better than that." 

Photo Credit Getty Images