With respect to calling flagrant foot faults long before anyone called them one of two things would have happened:
- your advice or warning was acknowledged and the server was trying their best to avoid them. In this case it would be quite obnoxious to still pursue an official and start calling flagrant foot faults, although within your rights.
- your advice was rejected and the game quickly became acrimonious as he starts accusing you of cheating. You keep warning and can't find an official; and he starts warning you and giving you bad calls. Both of you start playing badly.