Ryn I think we all individually have toxic folk in our life (it's my belief that we invite them on a level to help us grow in the areas we need to - whole other thread!).
I think personally the article is more about generally speaking how we see others and "take" their comments. We all know people where we have to watch very carefully how we word things for fear of attack or offense or upset. It's just hard work being around people that choose to "take" what is said as a personal affront. I reckon this article just points that out succinctly!