There is nothing wrong with old fashioned shouting, say a defensive wall free kick and you seeing argy bargy in wall as ref is maybe dealing with position of free kick or a sanction, shout (buzz if avail but not raise flag), "Jimmy, watch 5 and 9 pushing and shoving" or indeed yourself, "5, 9, hands off"
I can only speak for Scotland, but prematch, say, dealing with tech areas,,,,referees will say to AR "my tolerance level is your tolerance level", as in, if you are getting referee over to warn or dismiss a coach, then that's what the referee will do...(situation based on you as AR having grief with tech area, not something the referee has picked up on and is going to deal with regardless), the referee is these cases does not want a story, they cant second guess whats going on, they want "warn big man with hat on " or "remove bald guy with green jacket on", simple.
As for being AR and not being consistent with referee again this should be in prematch "run the line the way am refereeing the game, if am letting a bit go, try do same, if am stopping everything and clearly slowing things down, try do the same". its then up to you as a good AR to notice this and indeed not get ref over for yellows which if it was left to the referee he would be either having a word in passing or indeed nothing at all.
Is there really a referee out there who, if called over by the AR and is told "red card Blue 5" , with referee not having seen or heard incident, would not actually action the AR instruction? If so, pointless you having NAR , if nothing else away from the decisions in the game, that AR is, deliberately or not, going to struggle to give you the assistance that you deserve and require for the remainder of the game, human nature says that guy, when he see's same thing later in game, is he going to call it? 99% no, whats the point you already dismissed his advice previously.
Am not talking about a tackle you are both looking at and might have a diff of opinion over sanction, thats where the referee steps up to the plate and calls it, but, to try to have a say on something you have not seen or heard is very risky. again, only my opinion....