Hypothetically speaking, if one accidentally plugs the bluetti elite 200 v2 charging cord into an ac port on said power station, while the charging cord itself is still plugged into the side of the bluetti, and then immediately pulls it out, is that bad, or will it cause long term damage? What if the ac button on the power station starts blinking?
If you mean plugging the charging cable into the power station instead of a wall socket then that shouldn’t cause any long lasting problems because the AC inverter power output is equivalent to grid power output so you won’t cause damage. All that will happen is the power station will try to charge itself using its own inverter which will be lossy because of the inverter overhead so eventually you would run out of power.
If the charging power draw is higher than the inverter maximum output then you might get an overload warning but again this shouldn’t damage the power station it would just warn you and possibly turn off the inverter.
Most of the modern power stations have UPS systems and they will often give an audible warning or display warning if they suddenly lose power so for example if you pulled the power cord out the power station might beep or a display icon or button might flash to notify you that there has been a loss of grid power.
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@sacrilegious your unit should be fine. There is protections in place in these incredible units to prevent damage from most accidentals. @Sideeffect is spot on above, it’s not going to damage your unit, and you might see the unit show that it’s “charging”… lol but without any “actual” ac or dc input, you’re only going to see the SOC go down due to inverter/overhead losses.
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I have already done this 
I believe the unit sensed a feedback loop and the firmware shut down charging before it even started. I noticed it right away though and turned it off. This type of issue can easily occur if you have a blend of like cables near each other. I have two AC180s. One that only powers my 12V fridge so its on “all the time”. The other one I use to supply intermediate AC loads such as microwave, charging laptop, dehumidifer, etc. But I shut the AC port and unit off to save battery power. To wake the unit back up if there is no solar available and the unit is physically powered off I piggyback AC cable from AC Out Port of AC180 #1 into AC In (Charge) port of AC180 #2. Then to trigger the wake up I simply turn on AC port. I can then turn off AC on AC180 #1 and then turn on AC port of AC180 #2 using Bluetti app. What I did going forward was put red tape on the ends so I can easily tell I’m plugging the unit into itself. Or another way to look at it is IF i see the red tape i know NOT to plug it into itself.
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It won’t try to charge itself. It can’t due to the fact that there is a single circuitry that can act either as inverter, either as charger.