Pilots used to tell me all the time to turn off my strobes when I flew the ATR's. I always said, "I'm sorry, the switch says off, but I'll flip it the other way." I turned the strobes "on" for them to see the difference. The beacon was white on the ATR. FAA requires a "red or white" anticollision light. ATR had a white one.

GA aircraft are the worst and they don't listen when you tell them to turn their strobes off. I sat in a run-up area once in SJC with a Baron doing his run-up with all lights on including the strobes. He wouldn't turn them off when asked.

Crossing a runway: all lights are fair game. Safety first.