On Boycotts

Should I boycott Target stores because the left tells me they allow their pharmacists to refuse to fill prescriptions for emergency contraception on religious grounds, or because the right tells me they switched their holiday shopping decor from "Merry Christmas" to "Happy Holidays" and last year banned Salvation Army bell ringers in front of their stores?

Do these boycotts cancel each other out? Or do they get added together for a double boycott from both sides? Should I limit my boycott to their holiday items and pharmacy?

What about the fact that they sell those sweet, delicious Golden Grahams for only $2.50 a box?!?