This will be quick: appealing to a particular passage of Scripture in defense of your position during theological argument is not somehow against the rules. It probably just means you have a conservative, high view of Scripture's authority.
Most times it is easier for your theological dialogue partner ("opponent" is what they used to be called, but now you get accused of being necessarily divisive when you call them that...) to accuse you of proof-texting and carry on with his position than to actually deal with the passage you cited. But if Scripture is really authoritative and a passage really seems to say what you think it does, then appealing to it is perfectly reasonable.
Ok, got that off my chest. As you were.