Since 99% of my riding is commuter, I'll stick with solo. Actually, I don't like riding around other cyclists - they break my rhythm and it always becomes an additional factor to concern myself with.
I remember once, riding home, that I looked back and found a guy doing that drafting stuff right off my back wheel. I didn't know he was there. Gestured myself over to the curb and let him go by. Do your racing stunts with someone else.
And really, I like cycles but not necessarily cyclists. I'm 54, and I don't have a whole lot in common with them.