Sorry friend

This happened a few hours ago and I can't shake it. Leaving the house in my (slow as hell) car to get groceries with my wife, I pulled to the stop sign between my residential road and a more main near highway (55 mph, 2 lane per direction with grass median). I always come to a stop, look left toward the apex of the curve that would soon be behind me (roughly 1/4 mile after which the curve and hill means you can't see anyone coming), saw no one and started pulling forward with my head still to the left. As I got midway into the lane I noticed a sport bike (BMW S1000X or similar) behind me. I couldn't back up as he was gaining on me so I slammed the accelerator and kept in lane. I got up to 60 mph and came to a constant speed. 10 seconds of nothing then the BMW slowly passed on the left, giving me the finger the whole way. He turned at the next light, I was going straight otherwise I wanted to say hi and my bad. I'm guessing he was going at least 70 by how quickly he gained on us, but am not sure how much braking he had to do as I was doing my darnedest to stay ahead. Besides accelerating fast I thought to go into the left lane, but many times people have done that when I'm riding just as I'm about to pass on their left, and given the speed difference might have killed both of our reaction times. How can this be avoided? via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/enwhk3/sorry_friend/?utm_source=ifttt