Let's look at the facts. You had an unfortunate experience with a previous employer, but this doesn't mean it's likely to happen again. You are living and working in the USA; which enforces anti-discrimination laws, and is just over 70% white. American companies are overwhelmingly run by whites. In 2016 just 17.5% of US businesses were minority owned. That figure is far smaller when it comes to big employers, and probably the tech world at large.
So the reality is you aren't likely to experience discrimination in hiring or the workplace because you are a white male. It seems unrealistic to worry about it because of a few unlucky past experiences. On the other hand, if you have a name which sounds black, then you're far less likely to be invited to interview after submitting a resume than someone with a white sounding name. Even if you have exactly the same skills.
The real issue is the question of how to deal with your disabilities. Many big companies will require you to list these things when you apply. That's not a bad thing either, often it means they will be more understanding if you need anything specific to help you do your job. Most companies won't mind if they think you have the skills to do the job, and they like you. That's really the bottom line. If they think you're talent they'll make an effort to hire and keep you.
It also seems unwise to pretend you don't have a disability if it is obvious or does negatively impact your work. Then you're that guy who is too proud for his own good, or is incapable of realising his own limits, or just dishonest. Everyone has strengths and weaknesses. Accept your own in order to improve them, don't pretend they aren't there.
If they ask about disabilities it's not a bad idea to respond with a positive. Yes, I do have XYZ; but it hasn't been a problem for me in the past. I may need help with ABC sometimes, but I have a good record and am keen to prove myself.
It wasn't that long ago that autism made the front cover of The Economist. They concluded that people with Asperger's like yourself are often highly skilled and dedicated workers, and employers should make more of an effort to hire and keep them. The costs are often minor (giving an autistic worker a quiet space to work), and greatly offset by how much they usually benefit the company.
So let's be blunt: you're going to be fine. You are who you are, and there's nothing wrong with that. Both with regards to your disabilities and being white male. Don't shy away from admitting anything just because of pride or fear. If they turn hostile you can always find another better employer, there's plenty of tech jobs going these days. One estimate claims that there will be one million more tech jobs than can be filled in the USA by 2020.
If you're still anxious about this, stop reading stuff claiming that the USA is suddenly going to turn into Zimbabwe because insert emotional political nonsense here. People spouting such rot don't know how the world works and don't represent it.