It's actually funny, I ran into the new player bonus three times in a row last night while grinding for my Zodiac items.

(1) Hullbreaker Island, PLD was new, said out right he was new, everyone was happy and we progressed. We gave him a few pointers with the path, what to kill, how to avoid a certain set of mobs, etc. Told the PLD to flash more often because at this gear level, most players don't hold back any more and it's better to be inefficient and hold hate via spam versus losing hate and having things run amok. Things progressed well though at one point the BRD pulled "extra" (2nd set of Water Elementals before final boss) which I had to handle as a healer (our BLM nearly died). Overall, went well.

(2) Hullbreaker Island again, new DRG, didn't say a word about being new but we progressed as mostly normal. I gave a few pointers on bosses then found out later that the two DPS came together and were voice chatting it up (DRG made comment about those damn bubbles and the other DPS commented about laughing his ass off in voice chat with the DRG and apparently how he didn't remember the fight properly. Just kinda left it at that.

(3) Qarn HM, new player bonus comes up again, and once again gave pointers when we hit the bosses. Got to boss #2 then the tank (who was taking it at the normal pace) told me that the three were on voice chat together. So, I left the explanations to itself and we cleared no issue.

I find it funny how despite having new player bonuses all three times, we were able to progress without incident and issue. In fact, out all the Zodiac I've been farming for the last few weeks, I can safely say I've had 50% new player bonus sold message. I can also safely say that 95% of those new player runs had no issues despite very little being said. In essence, this i what I want to impart:

To the anti-speed runner / new player white knights
Your job isn't to babysit the new players. Your job is to GUIDE the new players. We're all (mostly) big boys and girls here. We can handle directions, it just might a bit sloppy on our first run.

Intentionally sabotaging runs for your own morale code doesn't prove anything. You don't fix a wrong with another wrong. To quote: "An eye for an eye makes the world go blind". If a silent tank goes off running, chances are those tanks know what they're doing (mostly) and have given a quick gauge of the situation. You can generally tell how potent a party group is based on (1) their HP and (2) their class. Most tanks understand this, and though some tanks are better than others, the vast majority of tanks will know "when to stop".

To all the speed run enthusiasts
As others have pointed out, a quick four to five lines of text per boss isn't going to hamper anything, and may save you three to ten minutes of wasted fighting and travel time (Killing the Flambeau in Copperbell HM comes to mind). Most new players should understand what a "speed run" is, and know how to handle it, but may need some specific instruction to "go here" at certain points that isn't obvious.

Doing this will save frustration down the line. If they tell you "we got this", then, well, you're in the clear. Not all "new players" will be "new", they may be there with a friend, they may have seen a guide, they may be an alt, etc, but a quick few lines won't hurt anyone's ego. Just be polite, tell them to watch for X, Y, and Z, and go nuts on the boss.

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Both sides of the debate here are really wrong if they feel they can "impose" themselves upon the other group. We are a group of players that play at varying skill levels and have varying attitudes. Just be adaptable and maintain a morale high ground, and that'll distinguish you from the idiots and/or trolls that may be part of your group (and you will run into then, deal with them appropriately, and not as a jerk)