So you state it's not a general tendency in Americadoxy but an impression made by a few active posters here?
Likely. Speaking for myself I tend to be more forgiving toward Protestant aberrations because
I realize that Romanism and Protestantism are flip-sides of the same coin. By declaring itself the sole authority in the Church Rome started the ball rolling for the state of Western Christianity today. From a Western perspective, Rome was
the sole authority (even today I hear the idea that Rome was the sole authority post-Nicea to the Reformation and that the Schism was the Eastern Churches rebelling against that authority put forward from Protestant sources that really should know better. I'm looking at you, Ligonair conference), this led directly to Protestant groups not trusting in any
human authority and placing the Scripture at the center seat. Protestants know enough of history to not trust papal authority, unfortunately they also don't trust any history from before the Reformation (at least in some cases) and are thus leery any form of appeal to Tradition or authority of the Church.
That said, while I'm willing to be more forgiving of the Protestant aberrations in the same way one might be willing to look into a person's upbringing when they commit a crime of desperation, I think I also tend to be a little harsher toward Protestants (here on the forum, anyway) in the same way a former alcoholic might be somewhat preachy to a family member with a drinking problem.