TBogg nails it, on folks on the right complaining about boycotts targeting individuals and businesses who contributed to Prop 8 passage efforts:

The kind of person who contributes money to deny their fellow citizens their civil rights are not someday magically going to be part of the solution: they’re the problem. These are not people to be reasoned with; they’re ignorant, they’re haters and they’re bigots and the only thing people like that understand is power.

So when they stick their noses in other people’s affairs, they forfeit the right to be considered just another “ordinary person”. They’re involved and they would be foolish to expect that those other people in whose private affairs they have meddled wouldn’t return the favor. As they say: you pays your money and you takes your chances.