Reading the article, he crossed the line by first insisting he kiss her in a skit, then insisting she kiss him during rehearsal, then when doing so when she had already expressed reluctance, gave her an open mouth french kiss, tongue and all. After her rebuke, he does some petty harassment and finally the photo of him acting like he was going to grope her. He wasn't a friend, had been given the brush off and he kept coming at her. He also wasn't a kid.
He wasn't a friend. He crossed the line. He apologized. She hasn't forgiven. It is it being petty to hold a grudge over this? I don't know but that's actually not for Franken to decide. From what she said, unlike Trump, Franken dropped it and didn't harass her thereafter. In my mind it isn't anything like what the pussy grabber in chief did but it's not nothing. That said, it's my bet other women show up to tell their story.
But yeah, my response is same as yours. Very disappointing. Not the outrage I feel when I hear Roy Moore's victims describe his actions. I don't vote in his state and so am just a bystander. If Franken runs for Prez, this would be some baggage to consider but isn't a deal breaker like the Alabama kiddy diddler's actions.