I see this as a perfect illustration of Trump's advancing demential. As you know from experience, people with dementia lose their filters and say whatever is on their minds while the rest of us just think it.

Fetterman could sue, but it would be an uphill battle. Trump excels at winning legal proceedings. And Fetterman might not want to draw attention to Trump right now. Maybe after he wins the election. But even then, I would recommend it.