The parent's comment was reasonably stated, and you haven't challenged its factuality. Also, you don't know that they downvoted you.
Regardless, what you said implies that no more than a negligible amount of garage doors don't use rolling codes, since the reason for my question was security related. If that's not true, I therefore wouldn't say your comment was strictly true.
All this is to say, votes up or down aren't that important. The attitude seems unwarranted.