I know, I don't have the Testicles of Objectivity. Just a lifetime of being a woman on the receiving end of men's masculinist agendas, which obviously doesn't count.
I mean, how much 'evidence' do you need to pronounce someone or someone's actions misogynistic? Do they have to wear a little badge? Shout 'I hate women' before every sentence?
His behaviour is, to me, indicative of certain unpleasant underlying preconceptions about women and their value to him. I don't have a signed confession by him that he thinks all women are sluts, no. Misogynists don't tend to announce it explicitly IME. You have to read it from their words and actions.
And I can see a difference between telling a celebrity you think they're pretty in a social situation of some kind, and responding to a business connection invitation with what may as well have been 'hurhur phwoar'. It wasn't a compliment, it was a power play. A compliment is designed to make someone feel nice about themselves. A power play is designed to put someone else in their place, which is inevitably below the power player. By reducing a woman to her looks in a business situation, she is put in the 'decorative/fuckable' box, which is below the 'full human' or even 'equal-footing business contact' box.
I suspect, however, I may as well be talking to myself here. Not having sufficient evidence and all, and merely sounding great 