My experience these last couple of years with "get the call right" is that the "other" coach is usually alright with the changed call. I get maybe two of these a year.

Also, I have NOT had coaches get ridiculous about asking me to "ask for help" all the time, on any close play. Yeah, here and there some dumb assistant says "you gotta ask for help", but most of the head coaches, the guys who I will talk to, understand when I can.

I had one case where I didn't ask for help on a swipe tag on the first base line while I was in B. I was SURE he didn't tag him. I didn't go for help. The game was delayed for 3 minutes with the coach being pissed, and the assistant getting tossed by my partner. My partner said I was the only person in the park that didn't see the tag, yet, I was SOOOOOOOOOOOO sure I had it right.

Generally, before "going for help", you let the coach know "Hey Skip, we are gonna talk about this, but if this call stands, we are not going to discuss it". This is fair, and when you do it, you set the ground rules. If he tries to argue it even after you "went for help", you can warn him to go back to his position, and if he doesn't, you can toss him.