I had a chuckle because someone is so easily offended by a manufacturer's warning label, yet won't recognize some easy remedies like the Sharpie idea, or even Cerakote options etc etc etc to remove the contrast. Most people recognize the appropriate tactic of ignoring offensive speech from loud-mouth suspects and not allowing it to anger you into inappropriate action, yet a warning label on your pistol drives you nuts!
On a more serious note:
Having the magazine disconnect feature can be a detriment. I've been shooting for a long time, and even I recognize that I've unintentionally dropped a magazine from my pistol during sloppy reloads, or even with support-handed shooting manipulation practice, etc.
Idiot labels won't get you hurt in a worst-case scenario, but losing that magazine from whatever reason, can.