Exactly.\ said:It's all to do with the context and whether the insertion is supportive or is obviously hijacking. Usually the intent is obvious.
As always it depends on the individual situation and there can be no right or wrong answer to such a generic question.
I have to say that people here are generally supportive and eager to help. I can't think of an instance when someone has hijacked a thread to show their model. Why would they? They can start their own thread to show their model just as easily.
Cheers
Steve