I'm cool with yelling provided they are not up in my face or within arm's reach of me and have me backed up or cornered in a room or very small space (like a bathroom or closet)
Though clearly I do not like it at all. The trigger is being close enough to grab or strike me... so it's the combination of screaming/yelling, intense anger, very close proximity to inflict harm, and someone raising their hands/pointing fingers/poking me. If I'm not backed up to a corner (no way to withdrawal) I try to regain the distance and space. I've got enough presence of mind to give a short warning (2-3 words) almost always 3 times ("Back off", "Move away", "Step away NOW" or something like that) then Ka-BOOM. I would do whatever it takes to get them away from me, stopping as soon as a "safe" distance is achieved and I have the chance to get out and away.
Early in this relationship I was very reactive. It linked directly back to situations with both my father and ex-husband and their special blend of anger/violence backing me up into a corner of a room or a very small space to overwhelm me or cause me serious injury. I had a lot of shame that I brought that baggage into my second marriage but it didn't take long for my spouse to understand (because he knew my history) to heed the warnings in the event of a heated conflict/argument and not put his hands on me even to try to calm me down, not corner or trap me in a place I can't walk away from, and if he is so angry he can't do the first two... to heed the warnings when I give them that I'm getting ready to go into "fighting for my life" mode.
It's very specific, and over time all three have to be present and he can recognize and take my verbal warnings.
I had a friend in recovery a senior librarian... in recovery early on when sharing about an incident... she told me the story of the hound and the rabbit.
When the hound sets out to go for the rabbit, the rabbit will run or freeze... but if the rabbit is cornered, the last thing a rabbit will do is turn and face the hound and attack it for all it can before it is ripped to shreds. That analogy helped my mister understand what happens to me with the trigger... the first two choices are removed, he continues to attack verbally and waves his arms around or tries to touch me and "wham" I go into fight for my life mode because in that moment I am right back to the most violent abuse situations with a parent or partner and it is straight on survival for me.
There have been none of these situations in a great many years. Close but not all three. It took a long while to pick apart the triggered episode and try to understand and get my partner to understand where they came from and how to diffuse them rather that go there... which I used to call "zero to psycho in 2 seconds or less". The shame though evaporated when I understood what was happening and why I was flipping into fight mode.
Blame... though intensely uncomfortable is not a trigger for me.