Threads like this get nowhere, as everyone is talking at cross purposes, and continues to think that comments are about other people, or about them, depending on what the comments are.
I always feel guilty (upbringing) in the way I did at school when we were told that ‘someone’ had done something, even when I knew I hadn’t, or hadn’t intended to. My friend always shrugged and assumed the Head was referring to someone else, so oblique references to bad behaviour (or ‘the sins that would surely catch us out’ as the Head would have it) really don’t help.
There is obviously an agenda here, and I assume that it is the ‘facts’ thread, which has an agenda of its own, but things may have moved on since last night.
To answer the question with no agenda - I don’t see disagreement as wrong, or being nasty. There is no point in discussion threads if the rules are that we have to agree, and forums like this would die on their feet if everyone bit their tongue all the time.
I prefer polite discussion to either rudeness or passive aggressive insinuation, which are, IMO, equally unpleasant and stifle debate.