First of all, anything that follows "no, you don't understand," is probably going to be an extremely irksome statement. But what I wanted to say was, I hate people who think you can't understand something unless you've personally experienced it . . . which, shockingly, I know, usually only happens when they've experienced something you haven't. Pretty much never happens the other way around.
They always say stuff like, "no, until you've had children, you have no idea what you're talking about," or "you've never been poor, so you don't understand," or "as soon as you've had your arm shredded and ripped from your torso by a rabid wolverine, you have no clue."
Ever hear of a little thing called "empathy?" Well, clearly, these people are so severely self-absorbed that they're totally incapable of seeing things from another person's point of view, which is why they project their own shortcomings, a lack of perspective, onto you. Yeah, your plight is so unique that no one could possibly understand what you're going through. (That would've been in Sarcastic Font.)
Listen, buddy, I don't need to commit a murder to get that it's a bad idea, okay? You're not special.