I am reminded of the Henny Youngman joke: "Doctor, doctor, it hurts when I do this" "Don't do that." Generally I want to trust people to judge whether an answer is useful, and in this case, people can. I don't think the answer was trolling. I do think telling someone who obviously wants to ride fast to ride slow is denying the legitimacy of the question, which is not cool. I could go either way.