It wasn’t a productive use of their time at all; just saying what they believed but not actually addressing anything people were saying. That’s not a debate, that’s you ignoring the input of others and using the platform as a damn mouthpiece. It’s also usually pretty clear when someone wants to have a constructive conversation; this person was never going to try and get anything out of what people were saying, other than “wow, how could they condone rape/incest/etc. and not ban it?”