Open carry is legal here though I rarely see it in the cities anyhow.
I did follow someone walking into a local WM recently who was open. No clue if he was LEO but he was wearing a white tee that made his black semiauto stand out even more.
Personally it didn't bother me but I bet he got a lot of looks. Especially as it isn’t common here. As for me, I dont think I would be comfortable standing out like that.