Refuse to patronize Trump products. He called for someone to be fired. Let his companies feel the wrath of the civilized public. NFL and NBA owners will improve their brands by staying their distance from Trump properties and products.
Why is this important?
The Occupant of the Oval doesn't seem to know that his current occupation is a privilege, not a right. He's using that office to enrich himself. Maybe if he did some honest work, he wouldn't demean other Americans.