You are not well informed about this subject it seems. Initially I was too puzzled on why Bangladeshis who almost have no presence in Indonesia can generate so deep and widespread contempt in Indonesia. Later upon investigation, I have found several reasons for this
1.Many Indonesians works in Malaysia and Singapore or have worked there in the past, most importantly, millions of Indonesians regularly visit Malaysia and Singapore as a tourists. So they comes into contact with Bangladeshi migrant workers there. Now In Malaysia and Singapore, more than 99 percent of Bangladeshi workers are male, many of them are single, on the other hand 70 percent of Indonesian workers in Malaysia and Singapore are female(TKW), many of them are single or divorcee. So as a natural sequence, there are some romantic affairs and marriage between Bangladeshi men and Indonesian women. It is not that Bangladeshi men are particularly lastful or depraved or trapping Indonesian women. Some Indonesian women are comfortable with dating Bangladeshi men may be because of religious similarity or other factors. But other Indonesians take a huge offense about such union and created many images and videos by other Indonesian workers and Indonesian tourists there. There are many viral videos in Indonesia about TKW dating with Bangladeshi men viewed by millions. So there is a widespread perception in Indonesia that, this is a huge problem, all Bangladeshi men are pervert and rapist and always looking for opportunity to molest Indonesian women. To vent anger on Bangladeshis, Indonesians have developed many racist insult about Bangladeshis, such as Bangla are black, Bangla's body stink like cow, onion or curry, Bangla are rude, mannerless, sexually depraved etc.
2. Many Indonesians consider Malaysia and Singapore to be there playing field. Reason range from ethnic similarity, geographic dominance and closeness etc. Indonesians expect privileged position in that two countries. Now Bangladeshis are going there, working, some even thriving have angered some Indonesian. Indonesian workers and tourists recording in Kuala Lumpur on how Bangla are capturing Malaysia, polluting Malaysia with their dirty habits. They troll Malay for allowing large number of Bangla, Malay becoming extinct, turning into Banglasia. I have found that between Indonesians and Malay at least 90 percent of anti-Bangladesh contents are created by Indonesians and commented by Indonesians. Malay have limited presence in online compared to huge presence of Indonesians. This may be due to the fact that there are only 16 million Malay in Malaysia while Indonesians number 270 million.
Look at the Indonesians making video on Bangladeshi migrants in Malaysia. Look at the headline and comments
3. Many Indonesians have idea that Bangladesh is the poorest and dirtiest country in the world. They use Bangladesh as the worst yardstick to measure progress in Indonesia and to feel good about and be grateful. With this purpose there are many videos in Indonesian language in youtube giving false information and exaggerating the poverty and chaos in Bangladesh. Even Jakarta's mayor 2 years ago compared the worst neighborhood in Jakarta with Dhaka.
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