I see this come up again and again on HN and this kind of logic keeps getting voted up: "You're complaining about [lesser evil] when there is [bigger unrelated

I see this come up again and again on HN and this kind of logic keeps getting voted up: "You're complaining about [lesser evil] when there is [bigger unrelated evil]. Therefore what you say is irrelevant." Sometimes it takes on this flavor: "You're worried about the well-being of [one person] when millions are starving every day. Therefore what you say is irrelevant." Is there some sort of fallacy name for this? This kind of argument says nothing.