Your options are very limited if you don't have an employment contract or a union agreement. The law prohibits unlawful discrimination, but personal dislike and animosity are not unlawful. Unlawful usually pertains to discrimination based on race, religion, national origin, etc. It is a sad fact that rude and disrespectful and even unkindness are not unlawful in the workplace, and under California law employees can be terminated even for erroneous reasons. If you don't think you can turn this situation around, you need to start looking to land elsewhere. I'm very sorry for such bleak news.
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Your employer would only be liable if it failed to take action to protect your from illegal discrimination or harassment based upon race, religion, gender, sexual orientation, military service, disability, etc. or retaliation for opposing illegal conduct. However, you have not provided any facts that indicate the supervisors bad behavior is motivated by illegal discrimination.
You may wish speak to human resources about the situation, especially if person who overhead the the rude and condescending remarks will support you, and request to be transferred to work under other developers or begin looking for another job.