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Generally you say you "feel" those low frequencies not "hear" them.

But I get what you're saying, what is sound exactly? Is it something that is perceived in our eardrum, or is it something beyond that?

Well animals can hear sounds at frequencies that we can't, so the cutoff shouldn't be when we can detect something. But in that case, do we set a cutoff on the lowest/highest frequencies that we know some animal can hear? Then we might discover something later that increases the range, what do we do then? It just makes more sense to generalize sound past what's actually audible, in my opinion at least.

Then would you consider radio waves to be "light"?

(I was implicitly including other animals, some of which can hear sounds outside the human range, even if they cannot participate in online conversations.)

Exactly. It's not sound, it's infrasound. "Sound" means audible to humans, much how "light" means visible to humans (e.g. radio waves are not considered "light").