They aren't actual rocks, you know. Metal frame, plywood, paint and texture, colorful plastic shapes...
Ridicule my weak excuse with logic?
It's okay, though. My coworker's excuses for not climbing are that he's "afraid of lichen" and that "6 PM is past his bedtime." I'm not sure which of those is worse.
On the other hand, he gets to hang out with you. Battling vicious fungi-plant monsters while sileighty fatigued is a small price to pay.