Erm, what?

Your argument now revolves around you thinking she wanted unsolicited creepy sexual objectifying comments because we 'don't know', which is obviously false. Just look at the picture she posted. Why do you think she wants sexual comments on that? Why would that even cross your mind?

for instance interpreting your remarks as a quite poorly dressed desire to present yourself as a sanctimonious defender of public morals

Please don't skirt around your desire to call me names. If you think calling out your creepy (downvoted) comment is me being a 'whiteknight' then just say so.

Maybe you know her in person and try to appear to her as a defender of her honour. I can only make interpretations.

I don't know her, but i do know what's socially appropriate to say.

You are right that I could have said other things, but it is up to me to decide how I express what I think on the basis of my interpretation. If I choose to express that "I know that you are seeking attention and I want you to know that I know it", it is surely my right to do so.

I also have the right to tell you that it's 'fucking creepy', which I did, but that you took issue with. I'm just here to educate you about the things you say and how you say them. I never said you had no right to be creepy, I was just telling you that you were being creepy. I think we both know that what you said was inappropriate and misogynistic, but now you're falling on the whole 'it's my right to say whatever the fuck i want' argument, which you then undermined yourself by taking issue with me exercising my right to call you out on your creepy comment.

My clue is the use of big scary words that you put in the tl;dr, as well as you engagement in replying

hahahahah what? What 'big scary' words did i use? You think misogynistic and objectifying are 'big scary' words?

The comic nature of the character that used it means that you cannot take it seriously, does it not?

But it isn't a good joke. It's just creepy 'you're a girl. I want to sex you' wrapped up in lame humour which takes no wit to say.

You say it to anyone in any context, and there is practically no possibility that it would be taken literally, and not ironically. And irony produces a reversal. We could submit it to a poll, but I guarantee you that no one would take quoting Joey literally. Of course, it may happen people do not get irony.

But this isn't a friend or someone you know. When you say these things on-line you're saying them into an empty space which could have any person on the other end. You also fail to understand what 'appropriate' means. It isn't appropriate to say 'how you doing' to a girl you don't know when she posts a picture. It isn't appropriate to say it to a random woman in the street. The person in the picture is the equivalent of that woman. You don't know her. You don't need to make a creepy sexual comment. It isn't appropriate.

Another thing, there is nothing "inappropriate, misogynistic" in it. Giving attention to someone who is asking for it is normal social behaviour. And it is objectifying only to an extent that posting your own picture is objectification of oneself.

Incorrect on all counts. This woman posted a picture of herself and a famous actor, in regards to her journalism career. You saw this as a opportunity to comment on her looks, trying to 'hit on' her on-line. This was inappropriate and objectified the woman in the picture because you turned her into a sexual object which you were lusting after.

Giving attention to someone who asked for it is normal social behaviour.

I've already taught you about what 'appropriate attention' is haven't I? Punching someone is a form of attention. Punching someone who talks to you isn't the APPROPRIATE FORM OF ATTENTION. Likewise, making these comments on the picture wasn't the APPROPRIATE FORM ON ATTENTION you should or could have been giving. It was MISOGYNISTIC because you made the woman into a SEXUAL OBJECT with your comment.

tl;dr (in easy, non-scary words)

your comment was not appropriate or needed. It was creepy and your arguments are based on false premises. Your attempt at humour was the equivalent of shouting 'boobs' out loud at a woman and thinking it's funny. You wouldn't say your comment to someone in the street, so don't say it here.