If I had a Customer that spent years relentlessly complaining about my Company, I know I wouldn't want to have them as a Customer. It does present an interesting question on whether a Company can be forced to have a bad actor as a Customer, I guess this will be decided in the lawsuits to come.
Companies in quite a few industries have a duty to do business with you, with very few limitations. For example, in some countries/cities, taxis generally can't refuse transportation to you, assuming you're able to pay and not endangering the driver. Having publicly and repeatedly expressed a dislike for taxis, or even wearing a t-shirt saying "taxis in $city are an overpriced monopoly" would not be a valid reason to…
Whereas one can often experience waiting for a Lyft/Uber where drivers repeatedly decline service after initially accepting.