Are you talking about the charity people with clipboards in SF? They're seriously the most aggressive people I've ever seen. I'm surprised they have card readers now. I think they used to just write your credit card details on a piece of paper.
I'm try to respectfully decline them, but if they try to passive aggressively guilt me, I teeter on the cusp of countering by attacking back and trying to crack their self esteem.
I haven't done it yet and wouldn't be proud of myself, but it would feel good.
I've seen the ones here do shit like yelling these animals are starving and abused while you go home to your luxury apartment, keep on ignoring their cries-esque stuff