[Usually learning the grammar and a decent vocabulary of a languages takes years;
In Esperanto weeks.
No need to exaggerate. I learned basic Spanish grammar and vocabulary in a few months; it could be done faster by somebody who's really motivated and devotes their full attention to it.
Perhaps you are that sort of guy who needs to refer to some authority when he can check easily on his own.
Why should he have to check claims you made? If you said it, it's your responsibility to back it up.
Very strange that an apparently innocent language can generate such hate reactions from people who do not know a word from it.
I know enough words - such as lingvoj
- to say that I honestly don't like the sound of it, but it's not Esperanto I hate. It's the pushy Esperantists who think they're on some sort of divinely ordained mission to convert the entire world to Esperantismo. Esperanto is not a lingua franca and it's nothing more than a fairly uninventive but moderately successful Euroclone.