As you can see, Zara was only wearing a bra, making the sign a little more icky to be honest.
While talking to Capital FM, she called the fan out. "I don't find that really funny because it's like 'do you think I'm gonna do that to you?'
"People were looking at him too, and then when people were looking at him, I think he was a bit ashamed - as he should be - and slowly kinda folded it back."
Good for her for making her disgust known during an interview, because as a 'fan', they should be there for her music, not to objectify her body.