I am actually speaking more about not just the ingame actions (i.e. pewpewpew), but their activities as well.
Take for example random Mission Runner 8,472. He talks ingame spamming nonsense. He freaks out and rages over salvage ninjas, but everything he is doing is in character (even though unbeknownst to him).
Then take, for a different example, random Self-Professed Roleplayer 1,226. In his corporate channel he is "out of character", in three other channels he is "out of character". In the Summit and in "RP" channels, he is "in character". Some of the actions his characters does are "out of character" (for instance running missions).
Who is the better roleplayer?
On the other topic of backing up RP in game with the pew, and also the pew, and perchance some pew:
I have no qualms with people who don't. However I do have a direct problem with people that make exorbitant claims and then have no way of backing them up. If your bio says you're a cold-blooded killer and an elite soldier and you've been around for exactly 1 day and your military career as a pod pilot is entirely fabricated, then I will immediately think you're an assjockey. If, however, you're an arrogant loud-mouth that talks a big game, but then gets his ass kicked, that can be entirely in character and I have no problem with that. It's when you have to fabricate accomplishment that I think that you are treading into poor storytelling.
Edit: OMFG I will spell exorbitant right I SWEAR TO GOD!