I don't think you have 'bitten the chap's head off' - you've provided what's really a stock comment response to a duplicate answer, commonly given on other users' posts, nothing aggressive in that.
Perhaps though you could have taken into account that the tone of the answer was a bit more personal-anecdote and lighthearted than a typical dup post, and adapted the comment in the light of that? That's all I can think.