Seriously some people need to be punched in the face so they learn matters
I'm sure whatever your uncle was saying was out of line. I don't doubt that. Now you have to worry about repairing any fallout you have in your immediate family (and over time extended family might get more normal).
No matter what, your uncle will think twice before saying anything about you, but everything comes at a cost anon. Especially with correcting adults behaviors in the family.
What you should focus on now is repairing any potential damage that could've caused. Unironically look at it like earning good boy points back. What you should do now is *avoid display any signs of aggression in your household* otherwise this could fester into something bad for you, like people in the house being afraid of you.
You need to build your PR up.
You've fought your battle, now keep your cool to win the war. Not if, but when someone brings up the uncle situation you just have to talk about it calmly and not defensively. Know what to say to disarm the violent nature of it in their eyes. That is key.
Praying to Jesus for your family situation lad. In my life, it helped me when I realize that I cannot expect some other people to act decently because they are not cognitively nor consciously on the same level. Some people are running on the operating system of a middle schooler.
And when someone is not consciously on the same level as you, they will inevitably act in a way that can fail you.
Wisdom is knowing when you push back on that behavior because it is greatly disruptive long term VS letting their flaws slide if the negative affects are contained and short term anyways.
Realizing that most people are children in adult's bodies can also help you see clearly.
Again, praying for you lad.