The heavy metal group - who have just released their fifteenth studio album 'The Final Frontier '- think that the world-famous annual music event in Somerset, England is too "polite" for them.
Singer Bruce Dickinson said: "Glastonbury is a bit too cream cakes and afternoon tea for us. It's all yurts and people being far too polite."
Bruce - who quit the band in 1993 and rejoined in 1999 - also admitted the group hate the celebrity circuit and the trappings that come with fame, but still love playing live.
He said in an interview with The Sun newspaper: "I loathe all the celebrity c**p - all the minders, the backstage glamour and the glitzy b******s. We hate it all.
"We are all about the music. If we could beam ourselves back home after a show, we'd go back to the shops as if nothing had happened. The rest is just fluff. It's nice but it's b******s in the grand scheme of things."
The 'Run to the Hills' singer admitted the legendary rockers don't make extravagant demands and amaze their friends with their simple backstage requests.
He explained: "We got rid of most of our rider. We just have three loaves of white bread, some butter, a tin of tuna fish and some beers.
"People come backstage looking for the spread and we say 'Go make yourself a sandwich.'"