In 2 parts : Warning Flags & Theory of Random Reward:
1) Warning Flags
If my son is waaaaaay out of line, and I send him to bed without dinner... That's a pretty neutral thing. If, for every infraction, I withhold meals? That's abusive.
To wit: even sending him to bed once without eating can be considered, by some, to be abusive. That's fine. They're welcome to think that a kid who eats 6 times a day skipping a meal twice a year will be some horrifically scarring event. It's not. It's; Dude. Welcome to seriously over the line, and bedtime. We'll discuss this tomorrow. You are confined to quarters. (If he pushes that, then it's grounded). We have pretty consistent levels of discipline. Certain things, like being banished from polite society? Follow certain events. The level at which he's banished changes with the exact nature of those events. The timing may well include missing a meal a couple times a year. No worries. He doesn't have attendant issues (like he's not underweight, diabetic, or anything else which would make that punishment dangerous, and need an addendum. His cousin, otoh, if I'm banishing her I need to provide snacks, as she's diabetic.).
My mom's a yeller. Over every damn thing, it's operatic levels (she did used to sing professionally, woman has major breath control & projection). From someone dropped a spoon, to being cut off in traffic, to the mail being delivered to the wrong place, to it being 9pm, to... Pick an event. If she's angry, sad, distressed, startled? She's yelling about it. We universally ignore her when she's yelling. She's not abusive. Simply loud. Very. Very. Loud. ((Although she is often confused as to why we ignore her when she yells. Um. Really? We're supposed to know that this scream-fest is important the last 40 were completely inconsequential? How?)) Some people would consider the yelling abusive, based purely on volume. It really isn't. She's never mean, and if you simply turned the damn volume down, what she's saying is all perfectly reasonable. It's just at ear-splitting levels. She's never out of control, and it never escalates.
However... Screaming at people, and withholding food? Send up warning flags. It's the context that either lowers them, or not. Which is why each of those things got a paragraph of context.
We all do things that send up warning flags. Because abuse & neglect are, by their nature, normal things taken to extremes. It's nothing to get het up over, unless it's something where the context makes things dicey, you know? Like yelling when you've lost control. That's concerning. It's less the yelling, and more that you're repeatedly in situations where you're losing control. It shifts the focus. Does something need to be done about your friends/fam? Yep. However, something also needs to be done so that you're not losing control. 2 issues instead of 1. S'alright. Lots of things break down into more than 1 issue. Especially with PTSD.
If it's still too hard to look at what you actually did when you snapped... Try substituting something you don't do. Like hitting things, throwing things, kicking things, breaking things, etc. All of which can be done in normal / not abusive ways, and which can be done when someone snaps, and can be done in abusive ways. Ex) Someone who hits things may regularly work out on a bag. Someone who hits things when they snap may hit a person or a wall (or march out to the bag, depends on the level of control still present). Someone who hits things abusively may target people or objects.
It's not saying you're an abusive bad person. If you scream at people when you've snapped... There are tools to use to circumvent that. Both ahead of time, and in the moment. So that either you don't lose control to begin with, or you get your control back fast enough that you aren't taking out your anger on others.