Yeah, it's tough to say much because we didn't see the kiss in person and they don't go into what kind of a kiss it was. Having been on the bus many times over the years I can tell you that there's been some pretty intense PDA's between hetero folks often enough.
I'm totally cool with kissing, hugging, hand holding and general canoodling in public. I don't really want to see a full on make out, tongue swapping session between people of any gender. So if the girls were going there I can see how that would make folks uncomfortable...but I'm not sure that's what was happening here & even if it was I don't care for the ditching them on the side of the road thing. I'd like more info than the article gives, but it sounds like they had a case of "ewwww lesbians".
Trimet and IHOP need a seminar or a removal of head from rear it seems.