Criminal until proven otherwise for checking that you didn’t miss anything in your cart? That’s extreme, people do make mistakes, if you actually want to steal you can still pocket stuff, the employee likely won’t give two shits since that’s a job for a security guard like it’s always been.
If you’re paranoic about being perceived as a potential criminal that’s fine, you do you, but labeling any sort of basic control as an accusation is not cool, might as well label the presence of a security guard as such.