1 Corinthians 10:32

Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God (KJV)

Then: Paul is still giving summary advice to the Corinthians. It is an "in-as-much-as-is-possible" statement. It cannot be an "across-the-board" edict, because there are times when giving offense to the Jews or to the Gentiles would automatically be an instance of giving offense to God. Just to please a Gentile, never pray to an idol and offend God. Just to please a Jew, never deny the sonship of Christ. The advice is also primarily advanced for situations inside, not outside the church. So the advice is practical - for particular instances, for two particular end-game purposes. Bring souls into the kingdom and encourage their spiritual growth.

Now: Christians often focus on themselves, not on the spiritual growth of those surrounding them. Listening to Paul and concentrating on his teachings will inevitably bring necessary spiritual growth to believers, mature and immature.