I use my Bible to show them in love what the Bible really says about a subject. In fact I had someone ask me to give her a Bible reference so that she can confront a false teaching
I use Scripture to show where and how that teaching contradicts Scripture. When we are confronting false teachings we cannot do it in a combative way but in love.
In the past, more so than now, I would argue against false teachings without responding in love. As I grow in the Lord, I am trying not to just point out the errors through aggressive behavior without love but rather share the “truth in love”.