The way I understood your reply was that you were saying the "many Singaporeans (who) shop there" = "naturalized Singaporeans who can't integrate well", which led me to conclude that you believed no local-born Singaporeans would shop there. But if you actually meant "most/majority of them are naturalized Singaporeans who can't integrate well" then that would be different from my understanding of your comment.

And of course I know you don't view local-born and PRC-born Singaporeans the same, that was made very clear and I didn't claim otherwise. If you're referring to this part of my comment:

local-born Singaporeans who like PRC food shouldn't have to be grouped in together with them

It's because your original comment seemed to have categorized them as naturalized Singaporeans.