Thanks for not answering my question at all. Again, why do some Christians take up such arms against sins such as murder, theft, adultery and homosexuality, but brush aside sins such as working on the sabbath, back-talking your parents or eating unclean foods?
I see nobody answered your question. I'll take a stab at it.
There are degrees of sin. There is a big difference between murder vs working on the sabbath. Even our legal system recognizes that, and you go to prison for murder but not for eating unclean foods.
Some things change. Pork used to be considered unclean. But today there is little danger in eating pork. Eating beef and chicken on the other hand have killed people with everything from mad cow disease to salmonella, maybe bird flew, and so on.
Imagine if everybody stopped working on the sabbath. Hospitals shut down and won't attend to that heart attack you may have just had. House on fire? Wait until tomorrow after the sabbath for the fire department to put it out. It's not practical to follow that law.
I'm sure parents are against their kids back talking to them, but what do you expect the parent to do? Stone their kids to death? That's illegal and the parents would go to jail.