That sounds like something spewed by a bitter, failed Catholic who knows little about what the Church actually believes or teaches.
Perhaps it is a condemning attitude that was referred to, and while it is true that modern Catholics can generally affirm baptized Protestants as Christians, most of what is seen in posts is denigration of them, as a result of the regular succession of articles on FR in promotion of a Church® as supreme, to whom all are to submit, and the resultant censure from the other side.
And while you see Catholics who hold that extra Ecclesiam nulla salus leaves non-Catholics damned as being bitter, failed Catholics who know little about what the Church actually believes or teaches, Lumen Gentium is open to some interpretation, and there are many Catholics who hold to what i believe is the more historical position of Rome, which does condemn “schismatics” to Hell, as seen here: http://www.freerepublic.com/focus/religion/2891087/posts?page=316#316
Sounds like typical Catholic projecting onto non-Catholics what they’re thinking.
That's a pretty typical reaction. When someone can't refute the data or facts, to attack the integrity of the person presenting them.
When former Catholics present what they know to be the facts of Catholicism and what they experienced as Catholics and it casts the RCC in a bad light and cannot be refuted, then the charges are laid of vindictiveness, bitterness, ignorance of church teaching, and all manner of personal character failures in an attempt to discredit what they say as being biased or inaccurate.
Since the facts cannot be disputed or refuted, the only option left is to imply that the messenger is unreliable.