take with a grain of salt
To take a statement with 'a grain of salt' or 'a pinch of salt' means to accept it but to maintain a degree of skepticism about its truth.
The idea comes from the fact that food is more easily swallowed if taken with a small amount of salt. (take with a grain of salt)
Take it with a grain of salt
regard something as exaggerated; believe only part of something.
No matter what that dude says, take it with a grain of salt.