I'm asking him to back his opinion up because his question was a loaded question:

Question: "Why not just use another crypto-currency?"

Load Question: "Why not just use a crypto-currency that isn't clogged by developers trying to make people use their proprietary service?"

He is applying bias to it from the get go, your comment is a bit strange, asking a question doesn't exempt you from asking honest questions that aren't loaded, you don't enter some realm of sanctity just because you're asking a question. You can ask for further clarity as to what the person is asking before answering it.