In those days, being Chinese was looked down upon. Many native Filipinos used to hold a racist and prejudiced outlook towards the Chinese. For being so successful.
Now a days, it's reverse, (here in chinese soil) thou they deny it, you can feel it.
It depends on the family and the people, i would say. My grandmother was open minded enough to marry a non-Chinese. There are Chinese-Filipino families that are accepting of marrying local people and assimilating. Why, most of the Chinese-Filipinos have converted to the local religion of the land (Roman Catholicism) , some are more fluent in Tagalog or Binisaya than Cantonese, Hokkien or Mandarin.
But there are others who prefer to keep everything Chinese. This is true, and it is in part due to the conservatism found in Chinese family culture. There is an emphasis in knowing one's identity and history. It is built within the Chinese psyche, particularly in reference to honoring one's ancestors and progenitors.
However, I would say that for the most part, the Chinese-Filipinos have assimilated into the Filipino Culture.
And what a great fusion it is.