Barclay is an egotistical obnoxious loud pompous ass.
But he can read a room, and is really aware that everything he is going to say is wrong so he suppresses and censors almost every word he creates in his mouth as its coming out, which is what sounds like stuttering.
He's not more confident around holograms, Reginald is just comfortably aware that he cannot alienate or victimize lightbulbs by accident because they have no real feelings.
In short, ordinary people are too weak and callow to cope with his awesomeness, so he has real fears about how they will inevitably strike back at him to assure their own safety if every thought brought forth from his head makes the rest of humanity feel like a 2 inch tall boob.
Oh? You think I might be suffering somewhat from transference? How rude!
P.S.
After 7 years practice, they should have been able to do better than "good".
P.P.S.
Wasn't Barclay the Commandant of Starfleet Academy, which is a rank equivalent to Admiral?
Google isn't sure. Someone needs to find a close up of his collar during his scenes in Endgame.
He's the beacon of hope, the SA community needed
And he didn't vanish into obscurity either (in a cupboard pushing buttons that open very unimportant doors) he's actually still doing quite relevant and challenging work
Everyone else is just too dumb to recognise the point of the holodeck.......you're supposed to get addicted to it, you sterile, sanitised goody two shoes......stop working on that equation to create a cure for human complexity and start programming people to acknowledge your greatness like a normal person would (throw in some lesbians of course)
