The only supermarket chain I was accused of shoplifting at, was a Sainsbury’s. I think the only thing I ever shoplifted, in my life, was one or two chewing gums that were sold for 1-2p each, as a kid over 30 years ago.

This was before the facial recognition thing was implemented, however not that long ago (late 2010s). I lectured the security guard right then and there, informing him of just how peeved I was at such blatant excuses for prejudice.
To be fair I believe he did apologise, and I was rather visibly offended, however I cannot imagine most people would be able to bring themselves to a defense in such situations. As if these things only exist to bully those who are expected to not stand up.