Ok, I am going to backpedal a bit.
Only because I think there are two different discussions getting all mashed together.
If you did read the thread the OP mentioned, I doubt you'd be that upset for the guy. He was a pig (no offence intended to pigs). As far as we know, he didn't actually have a small dick, or any kind of disability. He was a sexist who thought his assessment of female bodies was important. So, to hit him where it hurt seemed sort of ok - especially because he was slagging off his own wife's body. Sort of ok. [I realise 'sort of' is not a convincing term here.]
In general, no, the shaming of body parts, on any grounds, is shit. Women know how it feels so they should not perpetuate it. Agreed. And I am willing to concede that the aforementioned situation, although it contained an asshat who deserved it, does not help the cause.
So, I am sorry on those grounds.
But may I make one final point... (Hint: I'm gonna)
We have had pages of hand-wringing over one hypothetical instance in which a man might have been insulted in this way. Do you think the men are doing this? Do you think they see one suggestion that a man should tell a girl 'well, you're fat anyway' and they all spend hours worrying and arguing about it? Do they BOLLOCKS.
Now, I know this doesn't make it right, and we all have to rise above it and shit, and set the example, and never ever get just a little urge to shout 'Oh just fuck off you small-dicked PILLOCK' when we've been catcalled or felt up or intimidated just one too many times - because we are trying to set an example and be perfect... because if we get it wrong we are FEMINAZIS who deserve nothing but contempt.
But we're not winning, ladies. We're really not.