It shouldn't matter if his reasons are he wants to sit at home, get high, and eat doritos.
Businesses aren't families, employees shouldn't be discriminated against because another employee needs/wants help.
Businesses aren't families, employees shouldn't be discriminated against because another employee needs/wants help.
OR, as the article states, it has nothing to do with marriage and the married person is better at their job and gets to push their weight around more where scheduling is concerned.
Bear in mind that if the tables were turned, the other guy would be going all over the internet saying "My employer gave this shift to another guy because they hate children and discriminate against families with kids", and the same responses would be had in the opposite direction.
Making these choices is always going to alienate someone, but they're a fact of life.
Explain why not?