It was just one sentence. Only you can make yourself a "victim" of someone's words.
No, it just wasn't "one sentence." One sentence was the train joke. The other guy said something like that several times.
Do you find it acceptable to have personal insults or "jokes" made by someone in an official government capacity?
Let's put a slightly different spin on it. Say I was some hot woman (or guy, if that's the screener's thing) and he said "You're right, I do want to see you naked." Do you think that would have been appropriate? If not, why is the latter inappropriate and not the former?
It definitely wasn't the "dignity and respect" promised by TSA.