Does anyone else get annoyed by children begging for money for their school?

Every Saturday, there are children at every corner, at every store, at every bank begging for money for their schools. They are loud, jump right in front of my face, wave signs for their school and usually don’t have anything to offer for your donation. Some have baked goods, some have car washes, most don’t.
I find this extremely annoying and wondered if it happens in other places and if it annoys you. I also wonder what this is teaching kids. That it is okay to beg for money?
I have also noticed that it is mostly girls in very short shorts and tiny shirts. I worry that someone will grab them.