Considering the cultural stigma and the past it is likely that some of this behavior is the pure result of his upbringing. Topics such as insensitivity and racism are learned behaviors. I grew up in a house where berating the neighbors because of their skin color was the norm. It has taken years to unlearn what I thought I was normal behavior.You were brought up not to tolerate any jabs or demeaning language. It probably bothers you to the point where there is no tolerance at all, so you lash back at him.
You need to respond to this behavior with a negative response. Crying, lashing, or being upset is actually positive reinforcement since it is the expected behavior when you put someone down. Leave the room, terminate the conversation, or do something opposite of what he wants to do to show that his words impact the relationship, not just your esteem.
And of course, make sure to verbally discuss that you're aware that those types of behaviors are the norm for his cultural background, but it will not exist in the relationship or your home. If he can't make an effort to at least try to correct his ways or admit when he lapses then he might not value the relationship as much is needed for it to continue.
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