Well yes, certainly the internet does give people a space to say things they wouldn't say to someone's face - you probably haven't missed the furore over women bloggers and rape threats (discussed here for example).
And you're right, I wouldn't have said something you wrote was 'pretty rubbish' to your face; I apologise for that. It was my idiocy in forgetting Mary Beard was likely to pop along to have a look at what I was stupidly thinking was just a late night conversation with a mate rather than a deliberate 'Heh, I'm anonymous, I'll tell Mary Beard her talk was rubbish!' (Even I am not stupid enough to think you wouldn't make the connection once I posted an identical line on your blog.)
I've re-read the talk very carefully, though, and I still find your points about the Miss World protest itself strange. As a talk about ageing it is interesting (and I agree it's something that urgently needs talking about and I'm glad you're busting taboos about thickening toenails etc) but it does come across as you firstly, not being that bothered about objectification any more, and secondly, thinking the protest was pointless. I didn't WANT to disagree on this, I didn't come to this wanting to pick holes, and I more or less kept hope alive right up to the very moment where you say 'Don't get me wrong. We certainly needed that demonstration (my italics) in 1970.'
It is impossible NOT to read that as us NOT needing the demonstration now, and hence, despite what you say here, as you being critical of the protesters.
And you keep saying it is just about the fact you personally don't feel as angry as you used to about the body issues, but you are not just using the language of of 'I feel....', you shift into the language of big magisterial sweeping statements: 'where we should be protesting', 'we needed that demonstration....'