Telling someone they're not welcome ... WWYD?

[peanutter]

Yup. I suggested she go back and move her car (we'd only gone two stops) because I was concerned she might get towed ... we don't get along, but I don't want her to be without a car! In addition to not liking the idea that a person with a disabled parking permit may not be able to get a wide enough car park for them to properly use

[Sagres]

tell her that her views offend them and unless she can keep a civil tongue they don't want to catch the train with her.

I think this is the best wording I can think of, that her views offend the rest of the group and you choose not to play a part in those offensive sentiments so you no longer want to catch the train with her.

As for the friends I think I would try and call them out on their behavior, tell them the gigs up and it's time to sort it out or else (though not sure what the else would be!). Express to them that by trying to be kind they are actually being very mean and it's time for that crap to stop.