Can you get stds from sharing soaps?

No, but...: No is the real-life answer. That's because although there's a finite theoretical risk everywhere on Earth... we in real-life don't worry about catching sexually transmitted diseases from soap, shampoo, conditioner, shower gel, etc. To be safest in public bathrooms, one can rinse off after touching soap dispensers or faucet handles, dry hands with a paper towel, grab the door handle with the towel.