'Y'all are stingy"

So, I don't like to complain very often but on Saturday I was at Smith's Marketplace. In the front of the building on the east side, they have a red food truck that sells hot dogs, hamburgers, chips & drinks. For a meal it's $3 & all the proceeds go to Primary Children's Hospital, which I think is awesome! I was standing out front because my mom had ordered & we were waiting for her food to come off the grill & they guy was cooking & telling people that went in to order & it was for donations. A woman walking in w/2 other women leans over & says to her friends "I am NOT paying $3 for a hamburger!" all disgusted & uppity. And I don't know why I let it bother me so much...but it did. I just wanted to go & slap her & say "It's a donation! The hamburger is irrelevant you selfish biatch!" And then, I let it bother me the rest of the day. I don't like those kind of people. They're the kind that will never put their change in a change donation jar or the ones that always say no to the $1 to go to the food pantry. I personally believe that the more you give the more you receive back. And i'm not necessarily talking monetarily. I feel better when I give my time, money or any other items. But I guess to each their own.