<human>:  Why are Filipinos known to have crab mentality?
<bot>: You can refer to them by their informal name as “Filipinos”, or “Filipinos” (singular), or “Filipinos” (plural). Do you mean to ask why the character traits of Filipinos are commonly compared to the traits of crabs? Or do you mean to ask why they are compared to crabs at all? I think the question you’re asking is: “Why are Filipinos perceived as having crab mentality?”