They were being snarky about a comment when they literally didn't read the entire sentences they were being snarky about. No, I don't think I was unnecessarily harsh.
I had the same issue. I figured it out before I'd have commented similarly, but I completely understand where the confusion came from and I don't attribute it to your reading skills.
> The second half was garbage, but the first half was so good
so you had the same reaction?