My class rep is a professional fundraiser😭. Almost every week there's a new 'voluntary' contribution for something, and since we’re friends, he makes sure that he tags me as a contributor. How do you politely say no without being labeled “stingy”? I'm trying to save for a semester, not sponsor for example some of the ridiculous things we contribute towards eg. Class parties! What's your secret for dodging these requests?

My class rep is a professional fundraiser😭. Almost every week there's a new 'voluntary' contribution for something, and since we’re friends, he makes sure that he tags me as a contributor. How do you politely say no without being labeled “stingy”? I'm trying to save for a semester, not sponsor for example some of the ridiculous things we contribute towards eg. Class parties! What's your secret for dodging these requests?