Something about the phrase"plugged in" really bugs me.

So, some who read this blog may know that I am not "plugged in" to any "real church" "program." Instead, me and a good forty to fifty people meet on Sundays as friends before God, and learn from eachother, and God's word. Mostly God's word, and how we daily experience the truths of His word in our lives. It's a beautiful scene every Sunday which was put together by God's beautiful scheme. Unfortunately, some people feel that it's not enough to be doing what we're doing every Sunday. They think we should be "plugged in" as if the Bible tells us to be "plugged in... or else." My older sister, a senior in high school was at a youth group she had enjoyed attending for about a year. There came a time (very recently) when she became interested in going on a mission trip to Jamaica with the youth group. Keep in mind that she does not attend the church. Because that's the thing that gave the youth pastor grounds to say, and these were the words, "No, you don't come to this church, you're not plugged in. I'm looking for people who will work well together as a team, but I don't see you as one of them. You don't attend this church."
What a shame! How wrong is that? In an effort to get her to attend "his church" this guy used something important to her, already a believer, as leverage. This is not how it should be! The dude is going to Jamaica to spread God's word, and he rejects the help of a sister in Christ because she is not "plugged in." I would dare anyone to justify his reasoning! Such a rejection is uncalled for! How can you turn away someone so willing to come with you? Just because she's not "plugged in?"