Gavin DeGraw thinks everyone -- including Sinead O'Connor -- has a right to tell anyone to go f**k themselves ... because this is America dammit!
We ask Gavin about the crap Sinead is both taking and dishing out after she cancelled a few concerts and fans went on an Internet tirade against her. She blasted back in kind.
We got Gavin after he landed at LAX ... we're guessing he flew American.
Sinead Can Tell Fans to F Themselves
I'm a 1st Amendment Guy!
1/2/2014 12:40 AM PST BY TMZ STAFF
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