Slaves and women had to fight for the rights they gained against considerable social disapproval, not just from politicians but also from others within their group to get where they are.
Slaves didn't gain their freedom by fighting. They gained it by their oppressors deciding it wasn't the morally proper thing to do. It became socially inappropriate. The slaves didn't get Britain to ban slavery or start hunting down slave ships, and they didn't get Lincoln to ban slavery either.
Why else would it take 100 years of activism before women in the States were allowed to vote freely?
First, voting was only for landowners for quite some time. So neither women nor the poor got to vote. Then it was for men because men were the ones who had always made all the decisions forever and didn't see the sense in asking the wife's opinion. Neither, for the most part, did the wife. Then when some women began to agitate for the right to vote there was a lot of discussion, and both men and other women were gradually won over to the idea. It became, in other words, the socially agreed upon thing to do.
Yes, social disapproval can help keep people in line, as I said.
Then why is it not a valid tool to use against misogynistic cultural practices imported from the third world and wrongly instilled with a religious symbolism?
Why is this claim made so often about "the left", while "the right" busily imposes their view of morality on people through bathroom bills, blocking LGBT rights, blocking abortion access, imposing dress codes?
Is the right saying that boycotts and social disapproval is only acceptable against certain targets? It seems to me the Left enthusiastically supports it in some cases, then in others blithely says it would not be acceptable.
it's the concept of "Personal freedom"; perhaps you've heard of that?
Sure. I'm not saying women in these goofy shrouds should be forced not to be goofy. Let them wear clown masks if they want. Just don't ask me to have any respect for them.
My dislike or disapproval of certain practices does not give me the right to demand that those people change unless those practices present a clear danger to someone.
I largely feel the same. If the Amish want to live their quaint lifestyles with their period piece costumes, that's no skin off my nose. But there aren't very many Amish at all. There are LOTS of Muslims, and their numbers are growing by leaps and bounds. They will probably be our largest minority group, surpassing natives, in the next few years. They have a high birth rate, compared to the rest of us, and we are importing a hundred thousand more every year. I do not think it is in the interest of a secular, peaceful, Western oriented Canada to continue to grow a nation of rabid religious fundamentalists in our midst whose social views are diametrically opposed to ours.