Unless he lives in town where there are 24/7 24-hour convenience shops like 7-11, KFC and so on, he might find his local Malay shop closed on Friday afternoon; or during puasa month, he might find some shops closed for the month!
Thanks to Petronas, Malay owned or operated petrol stations are all over the place. But if he thinks the Chinese-operated Esso/Mobil stations should be boycotted, think again, they are slowly being renovated to show Petron, the name of the new owners, San Miguel, owned by Tun Dr Mahathir's son Mirzan. Similarly, Chinese-operated BHP stations are actually owned by Boustead which is controlled by LTAT.
In case he had a tyre puncture, chances are the nearest tyre shops which are likely to be open are run by Chinese. Of course, his car if under warranty might include a towing service provided by an authorised list of car service centres. He might have to inform the call-centre, that only a Malay serviceman is welcome to attend to him, definitely not a Chinese.
In case he is feeling ill, he has to go to the local government clinic or hospital. Again, with his deep-seated 'boycott Chinese' instilled in him, he might ask to be attend to by a Malay doctor. After treatment, he should insist on drugs manufactured by Malay pharmaceutical companies or more expensive imported drugs from the West.
In case he needs blood transfusion, he must insist on non-Chinese blood, with proper verification that this is so. Need anti-biotics? I am afraid those drugs are likely to be invented and/or manufactured by Jews, another group of people seriously boycotted by Malays.
The moral of my story which came to mind this Sunday afternoon is that life is already stressful, why make it more difficult? If we are more open, chances are much better in getting goods and services conveniently, and in certain critical situations, even lives could be saved by timely treatment.
At a shop, sometimes, we don't have a choice...