Where did the manners go?

You know... I must admit that most of guys among my friends are gentlemen. It's not about letting a girl go first through the door, allowing her to sit in a bus, just... being a modern knight in a shinning armour.

However in the last few days or weeks I've seen examples that some are either morons or don't give a **** about good manners.

What pissed me off lately?

1. At work we have two interns. Girls lets add. Those girls are new, they work here for 3-4 days. And two guys who apparently stopped their mental development at the age of 12 (when you see nude girls in Playboy) are trying to be funny and throw texts like "I'm scratching my George everyday." Apart from this being tasteless... Has anyone told them that this can qualify as sexual harassment? -__-
2. Coming back from a concert I had to go on my own. Around midnight. True it was city centre and theoretically nothing could happen to me, but still... most of guys would at least make sure that reach at least the bus/train stop safely, but no... this certain guy was interested in listening to the other part of the event (even if the whole trip would take him 15 minutes or so and he could easily come back to the gig).
3. You know... girl is still a girl. No matter what distance towards her she has and how close friends you are. You just don't say some rude texts like "your fat as a pig" or "shove it in your ass". No to mention "you're pathetic." I can bite back and tell such guy to shove those things into his bottom, but behaving like this towards any girl makes me angry...

I know that gentleman is a dying specie, but geez... Some should really be taught good manners -__-"

As I said, I have close friends who may be rude, who have talks that would make most of people feel troubled. However when a girl would be insulted in any way they would stand in her defence. But as I said... those are starting to be in minority.