Why do so many children hate the Walls family?

From the text:

Brian and Lori and Maureen and I got into more fights than most kids. Dinitia Hewitt and her friends were only the first in a whole line of little gangs who did battle with one or more of us. Other kids wanted to fight us because we had red hair, because Dad was a drunk, because we wore rags and didn't take as many baths as we should have, because we lived in a falling­down house that was partly painted yellow and had a pit filled with garbage, because they'd go by our dark house at night and see that we couldn't even afford electricity.