The context of the verse is much like Rom 14:5. Paul is telling us to avoid immaterial disagreements.
It is our duty as ambassadors of Jesus 2 Cor 5:20 to defend God's honor and the true material facts of scripture. Take this sites core beliefs as an example. Every core belief is considered an essential for Christianity and the truth.
Restoring a brother or sister that is stumbling on a core truth is true Christianity!
Now the devil hates the truth and will always attack a site teaching it. You will find many trying to start arguments, create rabbit trails and dodge direct questions on this site. This is not to say all are false teachers. But what is clear is that as we approach the end of days, the days get more evil and we are all getting a lot more dirt on our minds that is coming out in our posts.
A lot of Christian sites are having to deal with more and more heated discussions. It is not unique to this one.