And yes, sadly this is relevant, because, as much as we all have the right to decide when we are offended and not, there will always be people, consciously or not, who will game the system.
And you aren't offended by people who walk slowly in front of you - you are annoyed.
Similarly, in this context, I'd disagree: No, saying "dongle" in earshot of someone who tweets about "enhancing" the contents of one's shorts by stuffing socks down them does not give the over-hearer any "right" to be offend-ED, since it obviously isn't anything that this worthy regards as particularly offens-IVE. She obviously claimed the right to _maintain_ that she was offended, but by any sensible definition of the word she actually wasn't.
[Edit:] Duh, that's what I get for replying in a browser tab I opened ages ago -- I see someone said most of that already.