It will work the same way it worked for the non-whites in South Africa. There were the same voices claiming the South Africa sanctions hurt the non-whites. In the end the sanctions forced the whites to compromise. It took decades before the younger people in the U.S. became old enough to affect policy, and when that happened, the sanctions started being placed and began to work. With nukes and the most formidable military in Africa, many supporters of Apartheid (your racist analogs) thought that the sanctions would fail.
Big difference is South Africa ( Abdul going off topic again ) had nothing to sell to the world. Israel has everything to sell and BDS will see people in the US dying. If you are a true follower of BDS then get rid of your cell phone, computer, car, washing machine, dish washer, T.V. and live without all the other goods Israel has a hand in producing. Stop the hospitals from performing life saving heart operations on your family, and refuse to take prescription meds because they are sourced from Israel. Then stop your bank accounts and only deal in gold coins because Jews/Israelis are involved in all this. Finally give up your home as you will not be paying a mortgage to the Jew/Israeli that helped get your mortgage in the first place.