if you adopt scrupolosity on this issue you must follow the consequences.
you cannot shop in any store that sells this product
you cannot eat in any restaurant that sells this product
you cannot keep as friends any people that purchase this product
you cannot attend a sporting event at a stadium that advertises this product
you cannot attend a theater that sells this product
if you pull into a parking lot of a business and see the truck carrying this product you must leave immediately and never patronize that business
furthermore you must constantly check websites that track these things to make sure your judgement of this company and each and every one of its employees, officers and agents is accurate
and if you mean to make your boycott effective, you must inform the company of the reasons for it, and hope they are impressed by your decision.
you must, in addition, apply this standard in the same rigidity to every company who in any remote way cooperates with evil, assuming you have means to discover it:
hires illegal aliens
exploits its workers here or abroad
impacts the environment adversely in producing its wares
promotes or enables a GL agenda
cheats on its taxes or otherwise uses illegal accounting practices
If you are prepared to conduct every decision of your life as a consumer and sports fan by these standards, and you can morally justify that scrupulosity go for it, but you will allow little time for ordinary duties of daily life in so doing.