To be very exact, being offended is a choice, in that nobody can offend you if you don't let them. You can always choose to not take offense. (The statement in question does seem rude and dismissive to me, however.)
I believe the eminent feminist and humanitarian, Elanor Roosevelt, would have agreed with the fairness of your assessment.
Then @kn100 assigns to @bunnyfoofoo the offending behaviour.
It's the personal responsibility thing.
"I'm offended" vs "You're offensive".
I think it's pretty clear than the author believes he may have offended people with his statement, and is rephrasing in a more precise manner to avoid confusion.