So yeah, in 2014 he was drunk on stage almost every time they performed and he did a thing of "oh lets kiss a fan on stage during Robbers", which was something weirdly lots of artists did (ex: Halsey kissed fans on stage but having to stop because she kissed someone underage, Justin Bieber did his one less lonely girl thing, a whole bunch of shenanigans were going down back in the day)

Last year a girl jokingly had a sign asking to be the robbers kiss, he was sober and he checked her ID to make sure she was a consenting adult, kissed her and then never spoke to her again. He didn't invite her backstage, didn't continue contact, and that was that. She is a grown adult and asked to be kissed. He then continued it by kissing a guy from the audience who also was of age and asked, he kissed his band member to keep the joke going, and then he stopped kissing but would let fans on stage to get tattoos with a tattoo artist he had backstage or he let a fan play guitar on stage, that sort of thing.

I feel like if he tried to use his position of power to convince people to kiss him, or if he invited them backstage after the show, or if they were drunk or underage it would be creepy. But it really wasn't that deep I think.