Can happen sometimes. I down voted the comment after reading only the first sentence but then corrected it to an upvote after reading the rest. Not sure if many people have an attention span long enough to do something like this.
Even noticing the sarcasm, it just seems a bit... unnecessary?
It interrupts a discussion without adding much, so to me just seems snarky for no good reason.
While I appreciate sarcasm in a time of privacy crisis, I agree. We come to hackernews for discourse and try to follow the rules to have better discourse and comments that only provide sarcasm work against that.