You seem determined not to acknowledge some of the good and clear points that OB brings up, imo (e.g. the difference between punching up vs punching down; inclusivity vs exclusivity; etc).You are being intellectually dishonest to think that your "three word sentence" was not loaded with implication in regards to both the poster and anyone else who might find the joke funny. Again, hiding behind semantics.
Again, being rude is not a universal thing. I am sure most can agree that certain things have a very high probability for being perceived as rude, but does that mean that everything anyone could ever saw that could be perceived by anyone to be rude needs to be called out? I once had to write up an employee for their behavior in the workplace. We had several witnesses, including in her defense. I was told by a witness and by the person being written up, that I was being rude for detailing her behavior. I did not feel that way, nor did HR, so was it rude?
There’s some irony in the fact that, from my perspective, it’s you that’s sheltering behind the meaning of certain words, not OB, just as you’re accusing him of semantic-level obfuscation (e.g. in the subjective-objective distinction).