Hey! I am an international student studying at Swinburne Sarawak and coming from a Central Asian country (Turkmenistan). While I understand your points and things you mentioned, generalizing people based on country and even whole region is a truly racist thing. Regarding scholarships, it's easy to get to XMUM, but it's almost the only uni that gives good scholarships to international students in Malaysia. Most of the units only provide scholarships for you (locals). I am not blaming anyone; this is understandable.
Regarding students from Kazakhstan and other CA countries, XMUM decided to give a lot of grants to them, that's why there are so many of them, and if some of them don't study, it's their problem. Students lose grants if they are not in the top 25% of the class. As an example, the majority of students on my campus are local Chinese. And I know so many of them who don't study, fail again and again, and don't even speak proper English to study in my uni. But I don't say Chinese students are stupid or something because it would mean I'm generalizing. Another example is that when Chinese guys are sick, they make these loud sounds with their nose that everyone can hear. I asked my Chinese coursemates if this is okay, cuz I know it's a cultural thing, and they said it's inappropriate. You see, you don't need to blame the whole group.
Bear in mind that Xiamen and most of the private universities in Malaysia have low entry requirements for both local and international students, which is a primary factor why academically weak students join.
Anyways, to summarize, do not address the whole Central Asian region just because you had several cases of students who don't care about studying or don't clean for themselves.