Well, I will, simply because it is wrong. The "D" in D-Day does in fact mean "Day".
"D-Day", as a military term, was in use before what we now refer to as "D-Day".
The exact Date/Time often is unknown in the early stages of planning an attack/event, so the target date is referred to as D and H. This enables planning events to be executed in terms relative to the eventual D(ay) and H(our), "D-1" would mean the day before, and "H-1" would mean 1 hour before, "H+75 minutes" is 1 hr 15 mins after, etc. "Reinforcements landing at D+1"
The importance of the events of June 6, 1944 ("Operation Overlord") is why it has become "attached" to that particular D-day.
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