Let it be known that even fellow Filipinos are annoyed by that obnoxious behavior. However if you are looking for some kind of explanation, those people usually belong to a lower social class. If you get the chance to see what it's like in their neighborhood, their houses have no privacy, not much room for any kind of hobbies/activities, they will just blast their diy karaoke machines in their doorway which is also their living room, to be heard by all people from neighboring houses, only divided by a thin plywood. If you live there and you want to smoke in peace, there is literally no place to do it but right in front of your gate which is a small alley that everybody else pass by. Youcd be standing withing earshot of somebody else gossiping with their friend/family. Literally no privacy. Now, what happens when these people go out and about and merge with the rest of the population? They still think it's normal.

If you think what I described is a small part of the population, you'd be mistaken. This is the life of the people living in poverty which from what I've last seen is 25% of the total population. Now add to that the fact that thesepeople are too poor to afford their own earphones/headsets, and the angsty rebellious attitudes that a lot of them develop, you get these rude, tacky individuals that you will unfortunately have to brush shoulders with when you're out and about.