OMG! This woman just read my mind. I actually had to yell at someone recently; do you think I don't have problems of my own? Where do you think I get money from? Am I your parent? Don't you know I'm also looking for someone to dash me money?
People who do this are the absolute worst! Nobody owes you sh*t, so be sensible enough to ASK politely and when they tell you no, please be graceful enough to accept that NO means NO.