Until you hear a person play, you have no idea what level they're at regardless of what they say about themselves.
The world is full of people with cheap guitars,basses and other musical instruments...people who think that they're the next big thing musically but can't play much of anything.
They're not musicians...they're people who are in love with the idea of being a rockstar. It's more about being being a rockstar than it is about anything musical.
A lot of good bands probably get tired real quick of all the posers that show up for interviews/tryouts.
And these days when you tell someone authentically that they suck on an instrument they can get pretty upset.
So if you just advertise yourself as a bassist for hire....well..there's a million of those around and a good percentage of them aren't very good. Ditto for guitar players and drummers.
Maybe a good way is to have your own website etc etc et or blog with actual sound clips of your work that you can refer employers to....if you are not in a position to actually demonstrate your
skills in person based on their general pre-conceived notions about prospective players....
I include demos and links to websites but I doubt he checked them out. It reflects on his words!