Maybe they could but it was seen as being a bit show-offish and not done in polite societyBut Kal-El, being raised away from Kryptonian societal norms, did it because he didn't know any better. If he'd watched his dad's holo-recording thing all the way through he'd know this.
(
Tribs 🦇 ↓ dn ʎɐʍ sᴉɥʇ ↓🦇,
Tue 24 Apr 2018, 11:15,
archived)