Trump has crossed the line in many cases. He's an awful human being.
But I didn't see this one the way you do.
I see what you believe he was implying. But I don't think he necessarily was. I think he was just reaching for a compliment to break the ice.
If he knew he was allowed to say she looked lovely, he probably would have. But other folks would have jumped on him for that too.
It's an eggshell world out there these days. People require that you conform and take offense over nothing.