How do you do it? Do your own research. Gather your own data. Analyze them. Come up with your own theories. Have these peer-reviewed. Have them scrutinized. Have them published.
Or you can request access to the original researcher's datasets. You see, in science, multiple theories can come from the same datasets because of variations in interpretation. Maybe the interpretation by the original researcher is wrong. Maybe you have a better way of interpreting the data. That's the beauty of scientific inquiry.
But mocking, insulting, and name-calling researchers? These have no place in important discussions - especially discussions on history, culture, and heritage.