I highly disagree.
I want to be able to get Catherine onto Tormenta/Darkhart/ El Sudoron. However, Emily is level 36. I wouldn't classify Catherine as a "newbie." Don't forget it could be someone's 2nd or 3rd pirate.
And if a level 5 pirate wants to do some sailing around, visit the islands? I'm good with that. Just don't yell at me where I'm standing training staff to help you.
Usually if I see a level 10-15 on say, Tormenta, I'll ask them if they're just exploring, or if they want to get rep. If they're just exploring, I'll usually warn them that the enemies will KO them fairly quickly, so be careful. If they were told you can get quick rep there, I'll usually invite them to a crew and ask if they would like to stand back and heal me, or if they want to use a sword, I ask them to please wait till the enemy is about 3/4 of the way down, so they don't have a problem killing it.
If you see a smaller person where it's a better idea for them not to be there yet, you can whisper to them nicely and warn them that they should be a bit bigger before they attack whatever enemy you're attacking, so that they don't get KO'ed. Don't say "get out of here you noob" or something along those lines, that'll just make them angry