Please remember: each open source project is a different person, sometimes literally. That they share licensing ideologies does not necessarily mean the people producing them behave the same way. That said it's fairly well known that the pressure of hoards of obligated users on popular projects can easily push the most patient of authors over the edge.

As some anecdata: My experience in various open source projects as a submitter of bugs, fixes and features has been welcomed with respect and understanding even when we don't agree or I turn out to be the ignorant one.