If someone is responding in bad faith, then usually you just want to curtail talking to them. If you think it's still necessary to continue the thread due to the "audience", then concentrate on facts and sources and just make the strongest argument you can then just leave it alone. Avoid trying to get the last word or being goaded into responding just because someone said something that makes you upset.
In regards to clarification, that's easy, ask questions, ask for clarification. Just don't assume.
Do you have advice how to figure out if someone is responding in bad faith, and what to do in those situations ?
EDIT: > Avoid the backdoor route to building a strawman, don't add unspecified details or intensity to a post that isn't there.
What if you must add details to clarify what the context of the post is ? ex .Water is liquid. I reply But Water is solid when below freezing.