So..in a way this is a way of saying, "Your happiness makes me sad." I suppose
I actually have said this a couple times to people, quite bluntly in fact, with a similar blank expression in a monotone. When people get/are overly happy (as in borderline perky, just plain perky, peppy, etc, etc.), it makes me "sad". Not actually sad...it can just be upsetting to me. Most likely cause they are unwelcome. I will admit, perky can disgust me, make me nauseous depending on the person. Suffice to say, those kinds of emotions just rub me the wrong way.
How exactly I react or feel, depends on the person and situation. Whether I feel like duct-taping/stapling their mouth shut or just locking them in a closet. Depends.
I know that probably sounds mean or horrible even. But it's how I feel, and I'm not ashamed to admit it. I won't sugarcoat my own feelings for the sake of others.
So anyways...aside from the explanation...I hope others like this.
I'm a little iffy on how it turned out...I think I did well...