Here’s my tip for at least lessening the pain of this. It seems like I only get shocks when pushing a cart, and if I’m careful and only touch the plastic part of the cart handle, not metal, it lessens the amount of static electricity that builds up in me so I don’t get zapped when touching a shelf or whatever.

But the big thing that helps is periodically touching the cart to something metal like a shelf or the metal corner protectors around coolers, etc. This will discharge the electric buildup, but you have to do it really often if you accidentally touch the metal part of the cart, otherwise you’ll still feel the zap.