You get more flies with honey than vinegar.
In my dealings with people on these threads and in real life conversations I've found most don't want to be challenged in what they believe. Understandable.
In these forums I try to use what Rome has produced and compare it to the Bible. Often I find the two are in contradiction. I point this out. Many Roman Catholics don't like this. Some get downright hostile and resort to personal attacks and/or profanity. That's fine. It's a free forum.
Some engage in meaningful conversations.
Paul used both approaches depending on the circumstances.
He called the Galatians foolish because they had seemingly departed the faith for another faith.
Other times he used words such as brothers, faithful brothers when writing to the Thessalonians and Colossians.
As Christians we are not called to "live and let live." Those who are wrong often do not see the error of their way. Paul did not take this approach. He actively challenged people with the Gospel.
Christ did command us to go and make disciples of all the nations. This requires action on our part.