It is not typical of anything.Meets with a President wearing a T-Shirt, typical Hollywood disconnect. The old saying its better to over dress than underdress is a thing of the past.
If this were typical behavior it would not be news worthy.
If the presidents front men had done their job they would have anticipated this and told Vin a jacket is required.
Guys like Vin need to be reminded of social conventions.
Vin is a poorly educated college drop out who prior occupation was night club doorman.
Not to denigrate all night club doormen.
As long as movies with brainless plotless car chases and artificial impossible stunts are popular Vin will have a job but I doubt he will be meeting with the president in the future.
Clueless Vin did not understand that the whole purpose of the meet was so the president could get a photo op.
Ignorance is what it is and no need to make an effort to blame Hollywood in general for Vin being Vin.
What else did you expect?