A man who says he is the father of the woman who threw a banana at Adelaide player Eddie Betts on Saturday night has defended his daughter, claiming she has been "demonised".

In a video posted on social media, the fan was seen to throw a banana at Betts, an act condemned by the AFL as "clearly an unambiguous racist act".

Speaking on Adelaide radio station FiveAA on Monday, the man - who called himself Don - said his daughter has had the "racist card" played against her.

"Trust me (I am her father), I'm the most honest person," the man said.