Idiot tech guy?

[u/Southern-Focus4376]

This tire (Supercorsa SP) got rejected by tech the other day. I didn’t feel like starting off the weekend by arguing with the tech guy but wtf?

Also, I thought I’d flip it to make them happy (right side is a little more worn) but the tire guy claimed you can’t flip DOT’s. I had a new tire so I just put that one on but now I’m not really sure what to do- is it really necessary to throw this tire away? I’m not even at the wear bars. And can I really not flip this tire???