Supermarket "Rewards" Card

My partner insists on using the supermarket "rewards" card that tracks everything we buy. I've thought about ways around that, such as trying to get the data off the card and modify it, scramble it (?). Mostly, I just don't want it to track my purchases.

My coworker suggested to say I lost my card and then get a new one with fake information. I suppose that might break some sort of link between me and my purchases, but I'm …

card data don lost partner privacy supermarket thought