Both to blame

It was the attitude of the clerk that sparked the argument. On the other hand, like every time you bought a new appliance or similar stuff "read the manual", and here's the same, read the post! I was wondering what you'd do if your in-laws who didn't speak much English and wanted to practice shooting.... forget about it, it's not worth the lawyers, put the shop's name on social media and remind (not only Chinese) others.