This is actually a good question, and completely neutral, despite the Trump supporters here getting all defensive and interpreting it as some kind of hitjob.
Here’s an unbiased, non-hysterical way of looking at it: though I will admit I am a Biden supporter.
—Biden has laid his hands on all sorts of people at public events. From young girls to grown-ass men. He is a glad-handing, outgoing guy. Our current post-#MeToo culture views this behavior as suspect, though for a loooong time it was very normal. This kind of in-your-face politician physicality is known as “pressing the flesh” or “baby kissing.” It’s always been kind of weird, but there’s nothing necessarily sexual about it. Politicians at Biden’s level meet and greet thousands or tens of thousands of people. It’s what they do. Out of all the thousands of people Biden must have touched like this over the course of his decades-long career as a politician, only one (Tara Reade) has brought claims of sexual assault. Others have said that the experience made them generally uncomfortable without explicitly claiming it was harassment. Which, fair. If Biden touched my shoulders, I would feel weird. But I wouldn’t interpret it as some kind of sexual come-on.
—Trump has made several cringey sexualized comments about his daughter Ivanka. However, I view this more of a weird “proud dad” kind of flex rather than literally saying he has the hots for his own daughter. Trump seems to have a psychological impulse to brag about anything and everything, and to claim that he and his family are the best at everything — physical, mental, etc. The things that concern me more are the fact Trump has been accused of sexual harassment by over two dozen women, some of them claiming rape. That’s way more than Biden — also, Trump palled around with Epstein in the 90s and has had many photos with both him and his procurer Ghislaine Maxwell. No case against Trump for rape or sexual harassment has ever been proven in court, but they’re notoriously hard to prove (Weinstein was accused by over 100 women before he was finally convicted). Draw your own conclusions.