1. It is not an argument, it is a joke comment, it is not trying to persuade anyone of anything. It is a lighthearted joke.

2. Making a comment about someone's writing style isn't ad-hominem, also the original comment didn't make an argument at all, it just said that your opinion is wrong, which is a joke as an opinion literally can't be factually incorrect by definition. Here is a pretty good resource for learning about ad-hominem in practice.

That being said, you also fell into the very common fallacy fallacy.