On Sunday, January 8, 2017 at 10:15:40 AM UTC-8, Tony wrote:
ATC is going to say that about anyone not in radio contact with them, regardless of if you have a primary target only, mode c, or adsb out.

Funny then, that they don't talk like that about other, not-in-contact, GA aircraft transiting the area.

I assumed that was because the GA aircraft was traveling faster, in a more or less straight line, leaving a nice streak on their screen. This is also what NorCal have said in talks with local clubs.

Whether a glider with ADSB out would change things I don't know - there are none in our area so far as I am aware.