There isn't really a way to enforce this that doesn't violate a private company's rights. Protected classes are the closest thing, but I think you'll have a tough time getting "person accused of being a jerk" to be declared a protected class.
> perhaps they are simply too big and should be broken up
This, however, there's tons of precedent for. It's the right solution, and we should absolutely be breaking all of the big tech companies up. The current FTC & DOJ are heading in that direction[1,2]. If you like that direction, it's something to consider when you're filling out the ballot each November.
[1] The first stab from the FTC is at Amazon: "if the FTC succeeds in court, it could result in a forced breakup or restructuring of Amazon" https://arstechnica.com/tech-policy/2023/08/amazons-final-ta...
[2] And DOJ is taking a stab at Google: "[The DOJ] might even become emboldened to break up some of the biggest tech companies" https://arstechnica.com/tech-policy/2023/09/heres-exactly-wh...