Student or Learner
What does the following sentence mean? Somebody wrote me this and it sounded rude and offensive but I am not sure if it was meant to be rude or is it just a style of English I couldn't undrstand.
'Must have been a knock on the head that rendered you temporarily not responsible for your actions'
I was having a normal conversation with this person and then this came up, which annoyed me slightly. Please help me in understanding what was meant really.