Saying it that way will be much more helpful for the conversation. When people say something very easy like "Sources or it didn't happen", my normal gut reacti

Saying it that way will be much more helpful for the conversation. When people say something very easy like "Sources or it didn't happen", my normal gut reaction is to think "That person is just trying to waste my time because they have a contrary stance". Even better would be to say something like "Could you post the sources you used because this source[1] seems to say something different". Sometimes when you are honestly trying to convey some information, people who are contrary are just shouting you down. It's usually better to ignore them because otherwise you end up going down a rabbit hole of their choosing. But, at least for me, if I see that someone is genuinely interested in exploring the subject I'll usually go the extra mile and prepare the information I have. Sometimes it leads me to find out I'm wrong, and I'm always grateful for the prompting.