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You can divorce
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. >

I agree with you. Screaming and yelling is not necessary for a healthy relationship. >

Conflict doesn’t mean screaming or yelling. >

I think occassional fights or disagreements are understandable. My wife and I generally don't argue for months on end, but there will be one little thing here or there that fires us up, but then it's over in like 5 minutes and we move on.  But multiple arguments a week, especially big ones? Seems insufferable.
My wife's sister fights so much with everyone that it's normal to her. She implied, a year or two after my wife and I started dating, that it was a HUGE red flag that we never fought over anything or had screaming matches, and that we were headed for a major disaster. We've been together for 12 years and no disaster yet.
Some people are just so belligerent and disagreeable that fighting has become their way of life. It's their answer to everything and it is omnipresent, so they convince themselves that, clearly, it must be necessary, and perhaps even a good thing.
Human beings are fucking broken, hardcore. >

Wow she sounds like a crappy person. It’s probably because she’s not happy in her relationship maybe she’s always been in one’s like it so she thinks that’s what it should be and thinks she’s happy but how disgusting of her to say it’s a red flag you don’t fight honestly sounds like she’a jealous and needs to bring you guys down to make herself feel better. Man I hate peoples like that they are obviously unhappy and hate people around them for their happiness.
Idk how you feel about her, sorry if I went to hard but damn dude I’m sorry you have to deal with that from someone in your extended family. >

Lmao, that's it's okay, friend; my own parents have been fighting daily for the past 20+ years, pretty much. Hell, my mom even fights with my dad when he isn't around; she'll just vent to me and tell me how her side of the argument would go, lol.
My sister-in-law is just a straight-up narc; bringing other people down so she can elevate herself is her whole MO. Her and her husband get into some kind of blow-out argument at pretty much every holiday gathering. She's a bitch, plain and simple.
I think maybe that's the reason my wife are so easygoing; we both grew up around people who wanted to fight for no reason, so we've learned to pick our battles, and when there is some kind of disagreement, we just discuss it and move on instead of turning it into a screaming match. >

Married for 14 years.  We don't fight often.  Very rarely in fact.  
Here is the Key(s):  
#1: Communication.  Be real.  When your upset you have to be able to communicate that clearly.  And talk about the issue, talk about your feelings, do not throw insults to make yourself feel better.  If you just too upset, then take a break and go for a walk, then try again.
#2: Never demand a solution to a problem that you wouldn't accept if it was pushed on you.  The golden rule really is critical here.
#3: Learn to pick your battles.  There will always be things that come up and annoy you.  Learn to pick which ones need to be dealt with and which ones should to be ignored.
#4: This is a 2-player game.  If both of you can't learn to live with these rules/suggestions, then perhaps you should think about moving on to someone who will. >

#4 only applies before you marry. Make sure the commitment of marriage is something you're sure of before you tie the knot.