Perhaps you have seen the article 200 proofs that the Earth is not a globe. Google it and give it a read.
What you could do is start posts where you address each one.
This is the article that probably most FEers would point to as being convincing. Hence, if you addressed its claims you might start some robust discussion.
I’d certainly play devils advocate for ya.
BTW, don’t feel bad. I’m a scientist too, and get the same response. When an expert shows up here, the confidence and bravado that is normally present in FE debates seems to hide for some reason.
Of course, I can be kind of a dick, which doesn’t help really