Boycott mostly on political issues.
I don't consider it "boycotting" because of bad service or a particular business has screwed me in the past. I may not use a particular outlet but do not boycott the company.
I do not by products of France. Also, I try to avoid products made in non Right-To-Work states and traditionally liberal states. I absolutely will not spend money on a "Product of California". If I cannot find similar products from non liberal states, I will by imports. I boycotted McDonald's for years after they gave money to anti-gun groups back in the 80s, or was it the 90s. I also don't do business with Target. I won't buy GE products anymore after their support of Obama.