It was personal and its presence at the start of your comment was obviously abrasive. For our purposes that counts as a personal attack. It wasn't egregious, but (a) this kind of subtle nastiness toxifies the environment here, and (b) it marred your otherwise fine comment.

"It was a statement of fact", if true, is beside the point. Facts are often used as ammunition for gratuitous jabs. Indeed, they make the best such ammunition, because then one can say "I'm just stating facts." But it's the gratuitous jab that's the problem.