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One thing that might be helpful to know is that you saying you intend your comment a certain way isn't sufficient to remove the provocation from it. You have to show, not just tell, your intent.
In this case the first sentence was too confrontational for the second sentence to overcome the impression you were giving; as a result, people actually interpreted it as extra sarcastic.
Some past explanations that may (or not) be helpful: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
(We detached this subthread from https://news.ycombinator.com/item?id=41994146.)
https://news.ycombinator.com/newsguidelines.html
> Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith.
It’s not really about whether you sound nice or if sarcasm is preemptively dismissed. The problem is that there's no actual invitation or question and it comes across as presumptive and entitled.
What makes it even harder to take seriously is the follow-up: "[a]nd I mean that honestly, no sarcasm at all!" That line doesn't sit well, because it suggests you knew how it might come across but chose to push it anyway. A bit more curiosity or an open-ended question could have made all the difference here.