Fight fire with fire. Make a note of the advertisers and contact the advertisers demanding they pull their ads, just like the Left did with Limbaugh.
You don’t have to actually watch the show. Record it and fast forward through the program and then stop at the ads and write down which ads are shown. Pay special attention to LOCAL advertisers who are more likely to respond to demands to pull the ads.
Keep in mind that ABC is also Disney and ESPN. Parents who don’t watch ABC can threaten to boycott all things Disney.