Yes, there's some of that. And then we must question - is the sign of disrespect being implied, inferred, or baldly stated?
Now, as we all know, anecdotal evidence is lousy for making generalizations. However, it is still pretty good at breaking generalizations. In simple logic, if I assert that all horses are white, all we need to do is find one black horse to prove the assertion is false.
Let's try a statement - "Fudging is harmful".
There's an unstated qualifier in there - the statement is more probably more precisely "Fudging is always harmful" or "Fudging is usually harmful". If it is "always", all we need is to accept the anecdotal evidence from a single GM who found it not so to bust it down to "usually harmful". Then, we should (if we are reasonable people) need only accept anecdotal evidence from some number more GMs to bust that "usually" down to "sometimes".
Is it so odd that people read disrespect when a bunch of them make observations that seem to not be taken into weight of evidence against a general statement?
What it comes down to is this - if you aren't in the discussion to learn from the experience of others, and expecting (even actively seeking) to take their experiences to heart, that discussion is apt to go askew.
I'll buy that.
As speakers, I think we all tend to make a general statement or observation, and not qualify it. like putting "usually" or "in my experience" in front of these bold statements.
We also tend to toss out words like "wrong" on topics that clearly somebody disagrees on.
If I say, "Fish can't swim in water". That's quite clearly attempting to state a fact and it's wrong. It's not an opinion. It's a simple fact (not a complex one) that fish live in water, and they swim in it.
Wheras, on a complex topic like "fuidging causes harm", there's clearly 2 sides of the fence on this, and therefore does not lie in the realm of "hard or simple fact". Furthermore, for the sake of diplomacy, it'd probably be best to avoid using the word "wrong", because it sets the other side on guard, and they stop listening.
Personally, I like discussing things with people who don't do it the way I do, but are able to ask open questions of my method, and explain WHY they use their method. particularly when it is done in a way that gives me ideas to modify my method.
What makes these threads go south is when somebody escalates the defense of something, and stronger words get used, which in turn causes the other side to react in kind. Oft times, it's one statement poorly worded, leads to a retort, and so on.