It's not that fighting (whether a screaming match or throwing punches) is unavoidable, it's that conflict is unavoidable. At some point you will have a difference of opinion with someone you're in a relationship with, and it will require compromise and patience from both sides of the relationship.
But that conflict doesn't have to turn into toxicity or violence as you're talking about, as long as you can talk about it together.
The conflict-resolution tool you have available is open and honest communication, and while a little white lie is fine now and then it won't help you solve relationship conflicts.
If one or both sides are unable or unwilling to have that kind of conversation, that's when the problems start.