Of course you are technically correct Tom - but given that EF lenses all use the same rear caps and only the extenders use modified body caps I don't think that it is too much of a shot in the dark to twig what the OP was on about.
On a personal note, when I first came to photography, I assumed that the front of the camera was the side that I look at - not the side that the subject looks at = perfectly logical to an Archer, hence my mention of flinging arrows about. Even now I have to think about it a bit as, to me, the screen is on the front of the camera, but then I have spent more time with bows than cameras!
We know what the OP meant (or if we didn't then that is worrying!) so just give them the answer and, possibly, politely correct their terminology?
Life is for living, cameras are to capture it (one day I will learn how!).