I tend to use the C172 or the Mooney to practice IFR in and around the SoCal area, so the ‘not playing nice’ has not been a major issue, for me.
Most practice means ignoring the in-game ATC or use an online service like Pilot2ATC.
After a number of missed approaches and selecting a number of alternates, the game has to be stopped and reloaded.
KLGB is a fun one, crank up the number of AI aircraft, get ATC talking constantly, and you have a good simulation of SoCal airspace.