I remember when my Grandma died and I found out she was going to be cremated. I kept thinking "is that okay?", but I never asked anyone. I guess there was this feeling I had, maybe from a talk, or study, something, that it was a bad thing. Then again, I was always questioning everything I did or said, for fear of doing something wrong.
Regarding "a Jehovah", just because you may not have referred to a Witness as one, or yourself, doesn't mean it's not a phrase which is used. I no longer use it now, but when I left (8 years ago after being raised "in the truth") I would refer to ex-friends, elders, etc. as "you know, a Jehovah", completely loaded with sarcasm. I did it regularly (when the topic came up) and it was natural to me at the time. Of course, today, I use the term Jehoser and leave it at that.
To assume one hasn't been a Jehoser or a short amount of time, based on just a phrase, is not exactly the most effective way to make a point or come off as intelligent.