She clearly states in her blog she felt it involved "harassment and gender", which is often referred to as sexism.
She did the right thing by notifying conference staff and letting them handle it. She did the wrong thing by naming and shaming on twitter. The blog post reads like a mix of real event and revisionism to stem angry internetters.
Still, it's a storm in a teacup - who's to say the same guy wasn't on the verge of being let go for other reasons anyway? It's presumptuous to assuming his firing was solely because of this single event.