As with everything, there is a right and a wrong way to call someone out. For example, using the server forums, establish a blacklist of players to make others aware of potential problem makers or reporting them for potential griefing depending on the situation. Obviously, only a braindead monkey would sit on the fleet spamming 'OMG LOLSITHPWNU IS SUCH A NOOB! CUED (blatant word misuse for emphasis) AS A TANK N THAN WOLDNT TANK!'
Luckily we live in a day an age where there's such an amazing function as an ignore command. Whereby we are not ever grouped again with that player. It's really a fantastic thing, you should try out every other MMO that isn't about 5 years behind.