Hogwash. Where's the evidence that the people pictured said anything. Which one said what? At best this is potentially libelous. If you had video of them saying it or a photo of them making gestures, this is one thing. As well, the statements were not, per se, as far as I have heard, misogynistic.

If the facts of the case were different and we had the same response, I would probably side with you. However, it seems like this person is throwing a little temper tantrum and it is, apparently, a pattern of behavior of her's that doesn't help anyone. It's also very poor judgement for someone representing a company at a conference.

It seems a little silly to me for someone that is allegedly an evangelist for a tech company not to know how the Internet works.

As for the racism bit, since you brought it up, no it was a moronic statement without real basis.

I don't think Sendgrid cowed at all. I think this person has a history, apparently, of baiting situations and causing herself to be a spectacle, very inappropriate for a representative.