I don't think it's overly harsh to expect people, when talking about their own actions (and obviously when understanding the topic and terminology), and when in a discussion which is not a light hearted banter, to expect someone to put enough thought into that statement to make it true, at least to the degree it requires additional information to make them reconsider.

This theoretical exchange in a discussion regarding the merits of Chicken illustrates my point of view: Person 1: I don't eat chicken. Person 2: Are you sure? Person 1: Okay, yes, I eat chicken.

Person 1 has, at this point, proven themselves unreliable in their statements. Whether that is from a lie or mistake is both unprovable,and to me, irrelevant, because the end result is the same. I may or may not converse with them further, depending on other cues, but functionally, what's the difference to Person 2 or observers. I don't think that's overly harsh, just stating the realities of the situation. Sometimes people tell small lies, sometimes they make mistakes, but every occurrence affects your view of them slightly unless you expected that statement to be untrue.

So, to bring this full circle, the original commenter that asserted they didn't use default Apple apps may have lied, but it's far more likely they were mistaken, but in the end, I'll view their statements with a bit more skepticism now, as they've proven themselves capable of making a simple, assertive blanket statements about their behavior that they will recant at the slightest question.

Even so, I still feel the original reply carried an implied accusation of deception, for the reasons we've covered in depth. Regardless of whether the replying commenter was eventually correct, I don't think they had cause to use the wording they did at the time they did. We don't agree, which is fine, but that's why I felt compelled to make the statement I did, and while my wording may have been overly harsh (which I've already admitted), I don't believe my message was.

I assume we're done here, since your last statement was a single sentence whose purpose was to call into question my attitude, understanding, and actions, and offered little additional to discuss? In truth, I found that somewhat belittling, but am trying to ignore that aspect, as I may be misinterpreting it (and I try to be more forgiving of speech directed towards myself than to others). I've tried to be civil, and while this discussion wasn't light hearted, I did find it informative.