I think defensive means defending yourself?
I sometimes see op may post something. People may come along and reply. There may need misunderstandings along the way. Or the op jumped on. The op the tries to explain. And some people then post . Telling the op they are being defensive. I feel like it's used as a weapon to shut down the op.
But then I get a bit confused because it feels ls like it's used as something negative. But then surely the op has a right to stand up for themselves.
Have I totally misunderstood the whole meaning?