It doesn’t matter whether you authored the material or not. You posted it. And it begins in a provocative way. “In kind” responses ought to be expected. It doesn’t excuse the responders; however the poster bears responsibility for his chosen material.
Had you decided to post material that edifies everyone and offends no one, then you might have a case for having ruffled feathers. However, it would be a short-lived thread with few views and fewer replies.
It begins in a provocative way, not in a rude and attacking way. It is possible to be one and not the other; if the poster chooses to be both provocative and rude, or opts toward simply being rude, then the fault lies solely on the poster.