Some people are naturally gifted advice givers. They have wisdom and a gentleness that makes you want to listen to them. In my experience, moms usually give the best advice. Sure, you may rage against it in a moment of rebellious angst, but in the long run, you might see that they've actually been right this whole time.
Other people love to give advice but are horrible at it. Like your friend in a relationship who has never known what it's like to be single, or your childless friend who just tells you to "let them cry it out." But sometimes you need a bad piece of advice to realize you're actually doing okay, and you can listen to the voice in your own head. The folks behind these bad life hacks are a mix of both. There is wisdom cloaked in stupidity, but more often than not, stupidity cloaked in wisdom.