With Worf, the expat thing definitely contributes too.

That said, I can't help but notice that the clone of Kahless and the monks of Boreth seem to think fairly similarly to Worf, which is what makes me suspect there are some oft-ignored religious/spiritual writings guiding Worf's conduct.

Actually agree on point 1.

Humans in Trek WERE portrayed as being somewhat arrogant. To quote Tuvok from the Voyager episode "Flashback":

Valtane: Vulcans. You guys need to relax.

Tuvok: No, I will not relax. Ever since I entered the academy, I've had to endure the egocentric nature of humanity. You believe that everyone in the galaxy should be like you, that we should all share your sense of humour and your human values.

And Captain Sulu himself displayed said attitude:

Sulu: Mr Tuvok, if you're going to remain on my ship, you're gonna have to learn how to appreciate a joke. And don't tell me Vulcans don't have a sense of humor, because I know better.

Tuvok: I will... work on it, sir.

No, that doesn't work. Worf is more like the Black kid living with a Mormon family in the middle of Happy Vally Utah trying to be 'gangsta'.

All of the extremely generic and dull species encountered by Voyager in the Delta Quadrant that only varied according to the minor details in their forehead and nose ridges.

That said, I did love the Hirogen and Kazon who were also introduced in Voyager.

Vulcans.

For a species that prides themselves on pure logic, they certainly don't seem to notice the logic in being personable and relatable with their counterparts from other species who don't. The majority of Vulcans portrayed on Star Trek were arrogant, conceited, inflexible, and illogically demanding of those around them.

That having been said, both Spock and T'Pol warmed up over the course of their respective series, and became far better characters in the end. Tuvok, not so much.

I agree that it ought to be illogical to knowingly do offense to others in situations where you a) know it's offensive to others and b) you understand that offending an emotional being means you will not be able to get things done efficiently.

I also heard a line in my company's diversity course that was really good, and I'm surprised it's not taught to Vulcans: "Treat others not as YOU want to be treated--but as THEY want to be treated."

That ought to apply to human-Vulcan relations. That way, both sides have to make an effort.

Binars.

Hyper-evolved borderline cyborg race smart enough to know their star is about to supernova, build a fleet to conduct a mass exodus, and forget to build a second computer big enough to hold their collective history - so they need to steal the Enterprise, only ship with enough data storage on it to hold their complete history...

As I recall, they weren't building a fleet: they needed the Enterprise computer as a backup for theirs which had been damaged by a nearby supernova event.

There were some very strange species in one VOY episode. Captian Bracksten had been sent back in time with Janeway + ship and crew to earth. They were in america , and this guy had stolen Brackstens time ship. It is on this episode that we see a very strange species. It was a Human, with the spikey hair. Reason I do not like it is beacuse Chakotay did not and that is to modern for me. Sorry

Or maybe he's Carlton?

HE'S CARLTON! *LOL*