Kes
I'll Decide ...
Yes, but not really of any consequence unless he gives you a development mark for it.Like it or not some observers do have their quirks. One former step 1 observer, who sadly is no longer with us, had a thing about assistants not supporting free kicks with flags, so if on a game with him observing you'd keep your flag down if the referee is giving it, even if right under your nose.
And anyone who has refereed on the Spartan South Midlands will know of one observer who demands that AR1 takes out a spare set of flags, so you are going to do it even though it is totally unnecessary.
That sort of individual rubbish and "pet hates" is something a referee should appeal. In my own opinion of course.