How come Japanese men usually sound angry when talking. Same with Germans and can be said of Arabic. One time at work two Iraqi's at my work were having a conversation and someone thought they were arguing. They went up to them and asked what was wrong. They then replied they were just having a conversation.
You should consume more media in those languages. They can be just as gentle as any other language. It's just that most of the media portrays them like that. It has nothing to do with language at all.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.