I've seen even people who will attempt to discredit the data you've shown with kind of reasonable points like "the data is biased too, because it was collected

I've seen even people who will attempt to discredit the data you've shown with kind of reasonable points like "the data is biased too, because it was collected by people who have the same bias". Well, yeah, that's possible, I guess... but if that's the case, then no discussion is possible at all and we have to rely on the feelings and intuitions of the people involved... and we all know how reliable that is.