a mAn’S tOuCh
One of the most offensive things a man can say to a woman is that an issue requires a “man’s touch” to fix. Now, that wouldn’t be a problem if the man in question used a completely different method of fixing the problem from you, but this guy, like so many mansplainers out there, knows very little nothing about how anything works.
Just because you’ve used a self-checkout machine doesn’t make you an expert on fixing them. In fact, the employee who works with the machines daily will know more than you. Keep your “man’s touch” to yourself from now on, sir.