I would like to second my agreement with what @DREW WILEY and @Vaughn have said. I think it is too common for oafish comments to get lightly dismissed as, "boys will be boys," which may be true enough, but none the less, likely to sound offensive to some forum members.
One litmus test participants might use before posting a comment about female anatomy would be to ask themselves, "Would I say this at the dinner table if my mother, wife, and daughter were present?"
To my ear, the comment, "I've seen better knockers," does not sound like part of an inherently respectful exchange of views on a public forum, and probably should have been self-censored.
When I said, "I've seen better knockers." I was answering another post referring to door knockers. Apparantly, you read more into what I said, which reminds me of the joke:
So this guy is with his psychiatrist, who is showing him Rorschach ink blots.
"What do you see in this blot?" says the shrink.
"Well, I see a couple having sex."
"And what do you see in this blot?" asks the shrink, showing him another blot.
"Well, I see another couple having sex?"
"And what about this third one?"
"Well, again, I see a couple having sex."
"Well," says the psychiatrist. "You really do have a dirty Mind?
"Me?" responds the patient. "You're the one showing me all those dirty pictures."

