Light bouncing off of air molecules, yes. That's how seeing things works

That's what seeing is. Light. You can't actually directly observe the atoms that make something up. You can see the light that is reflected/emitted from that object.

everything you see is light

Responding to your edit:

You've got it the wrong way around. What you see at sunset, the reds and yellows, that's the sunlight being filtered because those wavelengths make it through stronger. Your argument would hold there, if we do not count seeing filtered light as "seeing" the filtering material. (Although even that I'd question - if you hold a colored piece of glass against a light source so it's entirely backlit, would you say you're not seeing it?)

But the blue sky is not that. It is the air molecules being illuminated by light coming from somewhere else, and bouncing that light back into your eyes, with a bias towards blue wavelengths. If that does not count as "seeing" air, then you also can't actually "see" fog, it's the same mechanism.

I'm kinda surprised how vague many of the DnD rules are written.

Didn't they have a rules lawyer at hand when writing these?

That depends on interpretation of the sentence structure. It could mean "any visible [creatures and objects]" or "any [visible creatures] and objects".

What? That's so silly.

Fey Ancestry just says magic can't put them to sleep. It doesn't cancel all magical effects that include putting them to sleep.

But it's more complicated than that. Imprisonment has the phrase "While affected by this spell, the creature doesn't need to breathe, eat, or drink, and it doesn't age." So, if you get rid of the only other effect (sleeping), does that mean they're not affected by the spell, and thus they do need to breathe, eat, etc.? Or does the spell affect them, because it still makes it so they don't need to eat, breathe, etc.?

Though you could argue that that's not the only effect of the spell. It also makes it so that you'll be detected by Detect Magic. Being an elf doesn't stop that, so you still won't need to breathe, eat, etc. Unless someone casts Nystul's Magic Aura.

Animate Dead targets a pile of bones or a corpse of a Medium or Small Humanoid. Create Undead targets corpses of Medium or Small Humanoids. Danse Macabre targets Small or Medium corpses. And you could technically use Animate Object, which targets objects, or True Polymorph, which can target either. Finger of Death and Negative Energy Flood both target a creature, but they just bring back the target as undead if the attack kills them.

But if you really get into it, the game has way too many assumptions to be played RAW. There's no rule that you can't walk through walls. There's no rule that when you're reduced to zero hitpoints you become an object or get transported to an afterlife dimension or otherwise can't take actions (assuming you die instantly and don't become Unconscious). Some weapons require two hands, and nobody can use them because none of the races are described as having hands. Thri-kreen have four arms, but no mention of hands at the end of them. You also need one hand to wield one-handed weapons, but this doesn't come up because no weapons are described as one-handed. And sometimes the rules contradict. There's a rule that in the case of a contradiction, the more specific rule applies, but that just adds yet another contradicting rule.

I mean it's tongue-in-cheek, and it's never really been a problem at my table. Just a fun way to remind casters not to argue about specific wording interpretations in spells, and take them as their most obvious meaning

Now, if a caster comes up with something clever, they can make an Intelligence (Persuasion) check to see if Mystra will allow something. Just don't tell Mystra how her own body works

Are you saying the example in this meme is good way to follow the word of the rules?