It's rude if it's a nice establishment, as it conveys your belief that the chopsticks are of low quality. So that's what you're signaling with that. If everyone already knows they are cheap (e.g. disposable), then have at it.

▲

triceratops 4 hours ago | parent [-]

If a nice establishment has splintery chopsticks maybe they should look in the mirror.

	▲	helterskelter 4 hours ago \| parent [-]
		Probably it's rude to do it automatically with every pair of disposable chopsticks and not just the crappy ones.