You should take his advice cum grano salis.
cum grano salis
idiomWith a grain of salt; with a bit of common sense and skepticism.
Origin
disputed originA New Latin coinage, derived from the phrase cum grānō salis (which was not used in Classical Latin).
The internet is full of rumors, so you should always read the news cum grano salis.
Historians often examine ancient texts cum grano salis, acknowledging that the authors may have had their own political agendas.