Why did I get reported for glitching?

[Hasan]

Since the thread isn't locked yet, sometimes i end up falling in these spots, or end up being attacked up a mountain, what i would often do is try to get up without getting killed, or just jump down to my death, sometimes i would kill the mobs (Due to us being at a high level)

So what is okay, and what is not?
And what should one do when put in a glitched spot unintentionally?