Why are people so damn inconsiderate?! I made enough food last night to have left overs for 3 days.…

Why are people so damn inconsiderate?! I made enough food last night to have left overs for 3 days. I got up later than normal to thinking I would just take left overs for lunch and found BIL passed out in my living room and ALL my left overs gone. There were 4 bowls in the fridge and half a pot still on the stove when I went to bed. I'm pissed!