I keep trying to walk away, and keep letting myself be drawn bakc in...
I don't think that has been said. Oh it has. You must have read that post, since you quoted it. Saying "You shouldn't make him wear a pink coat because it will make him a target for bullying" (which HAS been said, over and over) is victim blaming in the same way it would be victim blaming if you said "You shouldn't let your daughter go out wearing just a bikini, you are setting her up to get raped."
It was about posters responding to whether it was an effective technique or an appropriate one. Really? Are you reading the same thread as me? Because one of the first responses was "He would forever be the boy in the pink coat." The fact he didn't want to wear it is OF COURSE to do with gender stereotyping.
Anyway, you seem quite sure YWNBU so this has all been worthwhile sigh I was waiting for that. If you attempt to fight your corner at all on AIBU then someone eventually trots that out.
Despite the fact that my initial question was AIBU to send my son to school in his sister's pink raincoat, and ?I have since said "So whilst I may make a different choice if this situation arises again, ?I don't think the choice I made has actually done any harm." and "Taking on board the comments (however much I ideologically disapprove) if there is a next time I will let him do that." Most of the debate has centred around the likelihood of him being subsequently bullied in the future, and the extent to which that would be my fault for putting him in a pink coat.
But whatever. You read what you want into it. As it happens, it doesn't seem to have done any harm at all.