"This claim, or something like it, keeps being made but I have yet to see actual evidence for it. Could you give examples?"

Will people please stop asking for 'examples' of things that are manifestly true and evidenced in such proliferation that the word can't begin to do justice to the volume. It's intellectually dishonest and leads to a close dissection of one point on a yes you did/no I didn't basis that is in no way a search for truth but a divertion tactic from the main point.

It's also extremely condescending.