I wish people who are not attorneys stop using the phrase "assuming facts not in evidence" if you are not an attorney. It is a term of art, its a name of specific objection, not a general catchall phrase. Here is a list of objections for people who wish to know and the proper place and time to use them:
https://en.wikipedia.org/wiki/Objection_(United_States_law)#List_of_objections
I wish that people who were attorneys would act with integrity.