Someone said :
My sister's boyfriend went to an ISL class for a few months about a year ago - but never bothered to practice/attempt outside of class and I'd bet my hat that he forgets it all...either that or he just doesn't bother using it. Not that he initially learned anything anyway. What would you make of that?
What would I make of that? A typical hearing person who is only superficially interested in your sister and not really interested in her on a deep personal level. Never bothered to practise or attempt it outside of the class?
Not even to communicate with your sister? Hmm. sorry. A relationship is about give and take, working with each other.
Of course not everyone finds it easy to use ISL, but not even to try? If I was going out with a native Spanish speaker, I would learn Spanish. I wouldn't expect to be speaking English all the time.
But that's just me.