in my 8 yrs here in GCC countries, what i'd observed and base on my experienced that its not only filipino does not like to share flat with other nationalities, the reasons are; first is our food, each of nationalities have different taste and whether we like it or not its the fact that indians does not like the smell of filipino food and likewise for filipinos, second is the smell of the house, i'm not generalizing that all nationalities have a bad smell in their flat it just happened that we used different types of perfumes that have different sense of smell which for filipinos does not like the smell of perfumes of other nationalities and likewise for the others, and third is our culture, its not so easy to share flat with other nationalities that have different beliefs, etc. even if you both try to be nice, still you will fill uneasy sharing flat with other nationalities.
this is the fact that we need to accept, so for you guys don't be so pessimistic we pinoys just want to stay from any troubles and want to live peacefully.