AstroAssist, Thanks, I did get your PM and will respond to the astrology there.
I can't say that any of the following will work, but these were the HR department's recommended SOP at my former place of employment-- on a good day, that is.
Perhaps your best assets will be your ability to face your boss's unwanted behaviours with a sense of humour to diffuse tense situations, and ways of letting him know how you support his career goals and portfolio in your organization.
If you think you're past that stage:
I obviously don't know much about your particular situation and workplace culture, but if you are working in a reasonably large organization, do you get an annual written performance evaluation? Does Mr. Scorpio write it? One thing you might do now is to take the bull by the horns (sorry, no astro-pun intended) and schedule an appointment with your supervisor. Prior to this appointment, really rehearse what you want to say and how you hope to come across.
In your best modulated, professional tone of voice, you might say something like, "Doing well in this company is really important to me. I have the feeling from things that you've said that you are concerned about my performance. If I am only imagining this, that's fine; but if you have concerns I hope you will let me know now what they are, so that we can work out a plan of improvement." Then either agree to what he says, or else think fast on your feet with a non-threatening comeback. Like, "To meet that expectation, I would need...."
If Mr. Scorpio does this, follow through with a written memorandum of what you agreed to, and specific measures by which you both can determine whether you met that template or not within a specified period of time.
This is a way that managers with a problem employee "manage down" the supervisory ladder, but I think it would work "managing up" as well, as it gives notice that you're aware of his seeming displeasure with you and are prepared to meet it in a thoroughly supportive and professional way.
https://hbr.org/2017/12/how-to-win-over-a-boss-who-just-doesnt-seem-to-like-you
http://the-happy-manager.com/articles/manage-your-boss/
Another possibility, if there are several disgruntled employees, not just you, to contemplate safety in numbers, and to speak to your supervisor's supervisor. The "Asian" comment seems utterly unprofessional. Hopefully the higher-ups have an interest in keeping their talent happy; and the workplace non-toxic. It's best not to dump a Big Problem on a higher-up boss's lap, so be prepared to come with a modest list of practical and measurable ways the situation could improve.