Which pisses you off more grill poacher or those who backseat grill you?

The 4th of July is coming up and many people will be doing some grilling. What pisses you off more, that someone tries to take over your grill or people backseat grilling you? Some people are quite sly, they wait until you go to the John then slide in saying the meat needed turning, basting, etc then say they will “help” you out for you to go enjoy yourself when you try to take back your grill. Some just sit or hover close telling you that you need to add more this, use less that, watch your heat, you are starting to burn the burgers, where on the grill you should put what to make it cook better. Is that bad etiquette to backseat grill the host or try to commandeer his/her grill or is it being too anal fending off grill poachers?