It's easier to take precautions though. You probably don't have an insulated USB port or throwaway host device but handling QR codes safely just takes basic tech and skill.

Important advice:

• Don't use apps that auto-open URLs in QR codes when pointed at!
• Make sure the app shows the full content of the QR code and lets you peruse it indefinitely before you open the link!
• Know the structure of URLs and common pitfalls!

Recommendations:

• Be extra suspicious if there is no URL printed next to the code, or if the printed URL is different.
• Use an open source reader app (most QR codes don't contain secrets but it's got permission to use either camera!) that does not resolve Punycode (Unicode in TLDs).
• Strip any tracking parameters you spot before following any URLs.
• Be careful if the QR code could have been easily tampered with (on a sticker over the original one, or on a plain sheet of paper inserted into a plastic wrap together with the rest)

I think today's generation's equivalent is free Wi-Fi networks. Kids without mobile data in an area without an established public network will connect to just about any open one unless the SSID includes "LaserJet" or similar.