Checkmate wrote:
..

If you wish to make a contraction of "of course," "'course" would be
more appropriate than "'coarse," but...

'coarse is a deliberate red herring, Checkers... I had assumed an
intelligent lad like yourself would cotton on to that /off the plate\
.... so to speak - that you choose to maketh an issue suggests to me my
confidence in your intellectual prowess is perchance inflated - No?..
..