I would tell them that you:
1. don't believe in The seperating of the sheep and the goats before the great tribulation.
2. don't believe the door was closed to the anointed in 1935
3. don't believe the Faithful Slave is ALL of the anointed on the earth at one time
4. don't believe that the people of Sodom and Gomorrah will be resurrected
5. don't believe that the generation that would see the end was born in 1914 and end when the last of those born then die!
Ask them if they believe those things? When they say that they are old light and that they dont either, then ask them if they believe in what the FDS teaches or not? WHen they say that was old light, just say I am waiting on the newest light and not giving devotion or spending a lot of time on the current light which is undoubtably wrong soon. It doesn't mean you dont beleive them, it means you are "waiting" on Jehovah.