Business owner is a very vague term. You can get a business license in WA for something like $19. You don't even need a social security number, etc. I actually once talked to a man who told me he had a business license just to "impress girls". And years ago, before you had to apply for a permit to buy wholesale, people would get them to avoid paying sales tax on things at Costco, etc. I'm sure this is still a thing people do in various places.

That being said a small business owner may well pay less in taxes if they're a sole prop with no employees and a lot of business expenses and deductions. That's possible. But it's also possible they pay much more depending on their business and the various specifics around it. Or a large corporations may avoid paying taxes at all.

It all varies by state and industry and the specific activity and structure of the business, etc.

That being said, as others have noted, large corporations paying nothing at all is a bigger problem than anything else. And I do think that increasing taxes on the "rich" is acceptable.