Is it right for people to come ask for donations when we don't have money?

Earlier on, some students from a downtown college came to our door and asked for donations. We live in an apartment in the projects. My dad answered the door and they kept urging him to sponsor kids from a third world country "where he is from" they said. My dad told them numerous times that he does not have a job and he's been jobless for 3 years because he is disabled and no where is willing to hire him. They said that if he has a good heart, then he will for sure get a job, after sponsoring these kids. I was listening in from my room, and I finally came out when they convinced my dad to sign some papers. I return the paper to them and tell them that we don't need this. Then the girl that kept urging my dad to sign stuff said that it was rude for me to do that, they're just doing some school related stuff. So I ask her that out of all places she can ask for sponsors, why would she come to a place like this, the ghetto? Most people here can't help, even if they wanted to. She tells me rudely that they were igned here and everyone has been saying no and rejecting them, and I didn't have to be so rude. When I try to shut my door, my dad just stays there saying that it's rude to. So she keeps going on and on about what a good deed she's doing and how selfish we are, without understanding our situation. I tell them that we're not interested and that they can leave, and then she tells me that I could have said it like that and politely. When I shut the door, she screams *****. I can't believe it. I don't know if they are even doing this legitimately, for all I know this can be fraud to get some petty cash. Secondly, why would their college ign them to get sponsors in government housing areas? I'm so pissed off by how this women treated my dad and myself. People can't just come to other peoples door, asking for something and then giving you **** when they don't get it.