There's a level of enthusiasm that is adorable; like in living vicariously through ours kids and such.
There's a level of enthusiasm that is weird; like vegans, and subculture expressions (goth, punk, etc) in the workplace.
There's a level of enthusiasm that is obsessive; like repeatedly demanding answers to questions, or stalking someone.
There's a level of enthusiasm that is intrusive; like spamming every news thread about "look at me, I still want to know".
There's a level of enthusiasm that is delusional; like making wild claims around imaginary numbers of PvPers and such.
I make no claim of your position on that; but use it to understand that any pet peeve one has, is just complete nonsense to most others. At best fun to watch when someone discovers the taste of mustard, but gets real annoying once they decide to keep painting the house in it.