well if we are delving into pedantry, natural language is spoken; we learn our native language as pre-literate children and we already have our vocabulary stored in our brains with phonetic features way before we learn to read and write. Orthography is thus but a facsimile of our language.
We exchange and learn new words primarily by hearing them, and I'll bet "drop the mike" was first uttered out loud by a comedian/entertainer type, and to say that it even had a spelling is an unjustified leap.
I don't think any of these are true (that this particular argument constitutes or delves into pedantry, what 'natural language' is, etc) but we've probably extracted what pedantifun was to be had already.
mike is, sometimes, but 'mike drop' for 'mic drop', not so much. But for even more pedantry, that would be spelling rather than grammar pedantry.