Reason Banned:

Admin who banned: Jademanique
Length Banned: Perma
Appeal Reason:
Let's start by tackling the ban reason:
"You've been permabanned for being toxic as well as over escalation the past."
I've never been permanently banned.
"You were told to shape up, and you honestly dont seem any better now."
I haven't had a note or warning for toxicity or over-escalation in almost a year now, and my last ban was around the same time as well. This "ban reason" is, from what I presume, out of left field for some sort of grasping at straws.
Let me put context in the situation:
Jademanique does an adminbus. He spawns in a wizard (called the goose) and whoever gets the wizard's hat gets 1 ((modest)) wish. 20-30 minutes of shoot-outs and chases later, the wizard is finally taken down.
The wish from the person? Everyone becomes a non-antag ling.
Jademanique accepts.
Long story short, it obviously doesn't go well. People start dicking around and everybody isn't very happy about the bus.
Where do I fit in? I'm the HoP/Acting Captain. After chasing down the wizard who was disrupting the entire station for most of the round who even managed to kill a few people ("with only defense spells"), and finally taking him down at the same time while meteors are striking the station and the gravity is out, mind you, I decide to call the shuttle (after the ling wish is granted) and it's instantly recalled even though very little people want to stay.
The round drags on and it starts to become boring. The station's mostly fucked and a lot of important people (such as the HoS) were gone or cryoed. People start to complain.

Jade shuns the criticism off with shitposting.
So as the round continues to go on in it's half-functioning state, there's me, sitting in the bar. Take note of this message. (Notice the once again as well, Jade is repeating it, nobody is listening to him, people continue to dick around as ling)

A guy walks up to me, stings me, and impersonates me. I give him multiple warnings to stop or I'll take him down. He impersonates me over comms and walks into the bridge to dick around, then when I confront him he reverts back and plays dumb.
Keep in mind: lings can unstun themselves and can escape handcuffs, the usual only plausible ways of capture are killing them or them being so incompetent they don't know how to escape the situation.
So, after dealing with a mediocre adminbus for 30 minutes, meteors, no gravity, etc, (which obviously carries some stress) and me just walking in the bar and some guy walks up and starts to impersonate me, am I justified in killing him, especially due to how hard lings are to capture besides dead?? (it's code blue and he's a changeling with all access)

Again, he's a ling, it's code blue, the station is still recovering from a shit ton of huge problems, and he has the balls to impersonate the captain and infiltrate the bridge.

I explain to Jade why I proceeded with my actions. I also question why it would be logical for me to a-help it when the whole shtick was lings fucking around for the rest of the bus. Was it a mis-understanding on my part about the interpretation of what's allowed and what's not for lings and should I have a-helped it? Probably, but the scenario is extremely vague. You have lings, who have antag powers themselves, and then you ask them NOT to do antag objectives. Stuff like stinging and other abilities weren't elaborated on and seemed like a grey area and just added on to the mass confusion of the round, without even factoring the stress and weight of being pretty much a lone head of a wrecked ship.
After about a few minutes or so without any response from Jade to my questions, points, concerns, etc. , I ask for one.

After this Jade says (again) the same exact thing, though nobody bothers to listen and he doesn't bother to enforce. This time though, it's less vague after the fact.

Which brings us full circle to the ban reason.

I haven't been even warned for these two rules for months, why is it a perma-ban even if it was a justifiable ban?
For the toxicity part, was the swearing un-necessary? Sure, but you could probably see where I'm coming from after witch-hunting a wizard for 30 minutes while meteors hit the ship. I get a little bit of down-time and some random guy comes and makes a big issue for security (as a ling, mind you one of the most powerful antags in the game) I never made ANY toxic comments towards Jade in the a-help though. The whole mood of the round and everybody playing was stressed out and nobody wanted to keep going with the adminbus and Jade childly rubbed it off with "deal with it" and instantly recalling the shuttle with the response of just "No."
The escalation? Like I said before. If I tase, he adrenalines back up. If I cuff, he gets out of the cuffs. There's no way to go about this situation in a good way, especially since he impersonated me with presumably all access (the acting captain) and barged into the bridge with malicious intentions on a blue shift right after everything is in shambles. What way was I supposed to go about that?