The question was NOT "how do they spend it". The questions was very clearly "why do they need it" and as such is NOT a legitimate question (unless you're the one giving the money).
I do have an issue with people who are mean or rude. Your comment was not just rude, as in not agile; it appeared as if you wanted to say something to hurt someone.
If you father/spouse/best friend asked the same question, would you say "Get your nose back on to your plate." If not, then you should not give the same answer to someone you do not know.
Listen friend life is too long to go on being not sensitive to how you talk to people.
By the way I upvoted all your comments, because I want you to be enlightened. The world is a better place when you are nicer. You sound frank, so I assume you do not even know you were being impolite.