There appears to be some confusion and some misunderstanding concerning this case. These people are what's known as 'shomer negiah.' Those who keep shomer negiah cannot touch those of the opposite gender unless they are related to them (parent, sibling, spouse, child, etc.) To the argument that they just don't have to sit next to the woman, if the bus becomes crowded, it's inconvenient to leave a seat open while others have to stand. It's important to keep in mind that women cannot touch men either; it is just as much in their advantage to sit in a different section of the bus as it is for the men.
Some will say that the order (men in the front, women in the back) is purely coincidental. Call it cynicism, but I doubt anyone in the community would consider the reverse situation. However, it isn't based on discrimination, like the Jim Crow laws that MLK fought against. And in the end, SOMEONE has to sit in the back. So no, it doesn't bother me and I understand the situation. It's a private bus, and the woman should respect others' beliefs.

Not surprised. My high school teachers told us we weren't allowed to friend them until we had graduated; my Spanish teacher actually had two facebook accounts: a normal one and one for her students to friend!

Minor correction: the viper is evolving more deadly venom, not poison. Snakes have venom, not poison.

I think you mean 'techelet' or 'techeles', not techelel. That's the blue dye mentioned in the bible. It was used to dye the fringes on the prayer-shawls (now the fringes are white, because there's no more techelet).