Sarcasm is use of language, potentially caustic, potentially ironic or humorous, to mock someone or something, e.g. if I were to respond to your comment with "What a witty and clever response that totally adds value to the conversation".
What you did was reiterate the same point that @caldarons had already made themselves in the paragraph immediately following the one you are now quoting.
Also, it's hypocritical to mock @caldarons for your failure to understand what they wrote, while also blaming the people who reply to you for not understanding what you write.