That still does nothing to refute the parent's complaint about democracy. Lopsided representation is still representation (as opposed to a council of nobles or military generals or whoever).

Also the thing you're objecting to is literally the entire point of the senate from day one. It was intended to give less populous states an equal voice in contrast to the house of representatives. Unfortunately history happened and the house of representatives hasn't been proportional for a long time. But if you're going to complain about something it should probably be the latter rather than the former.