I am sure there are far many more people who didn't sign the boycott who are avoiding TGT like the plague. I didn't want my name on a list of SJW enemies, but I sure as heck don't want to go to TGT either.
I am not going to sign the boycott because I don't want to be put on some liberal enemies list. Many people who are boycotting probably are not on the list too. Target management made a stupid move. People don't shop to be indoctrinated; they just want reasonable value and a positive shopping experience.