The Bible instructs us to accept any genuine believer, even those weak in faith, and not argue with them about their personal preferences and doctrinal opinions.
Rom 14:1 Accept other believers who are weak in faith, and don't argue with them about what they think is right or wrong. (NLT)
However this does not mean, as many suppose, that we must accept everything another Christian says or does, and not say anything. The Bible-approved disputes, judgements, arguments between Christians are those involving Idol worship and gross sins such as fornication, coveting/greed, reviling and other sins (1 Cor 5:9-11, 6:9-10, 1 John 5:21, 1 Cor 8:4-7), division (Titus 3:10), and denying Christ's incarnation (2 John 7-11) and Judaizers (Galatians 2:11-14) or anything against the gospel of grace.
Rom 14:1 Accept other believers who are weak in faith, and don't argue with them about what they think is right or wrong. (NLT)
However this does not mean, as many suppose, that we must accept everything another Christian says or does, and not say anything. The Bible-approved disputes, judgements, arguments between Christians are those involving Idol worship and gross sins such as fornication, coveting/greed, reviling and other sins (1 Cor 5:9-11, 6:9-10, 1 John 5:21, 1 Cor 8:4-7), division (Titus 3:10), and denying Christ's incarnation (2 John 7-11) and Judaizers (Galatians 2:11-14) or anything against the gospel of grace.