You can lock 2 bikes to a U-shaped bike rack without making the second rider get filthy digging through your wheels to insert his lock. It's easy:

Yes! https://www.groundcontrolsystems.com/wp-content/uploads/2016/05/HR100-2-1000x550-2.jpg

No! https://www.groundcontrolsystems.com/wp-content/uploads/2016/05/HR100-2-1000x550-2.jpg

Stop being selfish!