Targeting is effective. No single church can possibly reach out with equal success to every conceivable person. The church becomes more effective as it clearly defines who it's trying to reach. No wonder that, from the first century, it has seemed to please the Holy Spirit to birth a wide variety of churches in order to reach a wide variety of people. Targeting is a missiological issue.
Every church finds itself in a unique context, a unique mission field.
A spirit of exclusivity, or separation on the basis of prejudice, should be deplored. But this is different from acknowledging the people God has uniquely gifted, impassioned, and positioned you to reach. Targeting is not the refusal to take the gospel to the whole world. Nor is it ignoring the diverse range of generations within the church. Instead, it is acknowledging the characteristics of the place where your church resides and developing your outreach accordingly.