A boycott is based on an organizational movement, such one lead by an agricultural laborers union.
In the case of football, beer and merchandise, the avoidance is based on individual shunning of obnoxious behavior or products.
Prior to the late 1960s, working class people tended to vote Democrat. For about 55 years, working class people tend to vote Republican.
Prior to the 1930s, blacks tended to vote Republican. Ever since the Great Depression, blacks tend to vote Democratic.
I don’t think there were any organizational boycotts in the cases of Anheuser Busch and Target. A huge number of Customers simply refused to patronize them.