By "correct" I take it to mean the way you understand it. Hilarious. In Matthew 18:18 Jesus isn't talking to all Christians he is talking to the disciples.
What you need to do is show evidence that "your" understanding of Scripture is authoritative. Thus far though all I see, is someone else told you that Jesus is talking to all Christians in Matt 18:18 even though he isn't. If you REALLY believe you have the authority to bind and loose on earth and in heaven then you're way outside the realm of reality.
Not sure why you understand my understanding as "hilarious", nor why you see Jesus speaking only to the Twelve rather than to all disciples in Matt. 18:18, but I have shown more evidence than you (Mark 11:24) and have as much authority as whoever told you differently. In heaven we will learn whose understanding of reality is within the realm, but you seem to be blind, so I will enlarge the print:
binding and loosing must be in accordance with God's will.
Over...
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Scripture NEVER says all Christians can loose and bind but make it up as you go, right?