"Oh, but they can. At least when it comes to taboos and insults," Mirage scoffed, glancing back over his shoulder.

"And I am. You should look up the Cybertronian-Ferralian relations some time. Negotiations with their planet stalled for vorns because the ambassadors kept stomping off in a agitated, offended huff, claiming they were being threatened!"

He waved a hand, optics rolling dramatically.

"Turns out, our lack of liquid-based optical sensors - and the fact that we don't need to blink like organics do - is a threatening gesture. As soon as we began imitating it with optical flickering..."

He shrugged, hand flapping in a 'there you have it' gesture.