I used to be like this when I was younger, partly because I didn't want to piss people off, but mainly because I didn't really know enough about either. If someone's already warm to the idea of "communist synthesis " or whatever, there's a very good chance you can radicalize them by deflating their idea of capitalism. Try asking them what they think the bourgeoisie do or what they contribute to society.
I used to be like this when I was younger, partly because I didn't want to piss people off, but mainly because I didn't really know enough about either. If someone's already warm to the idea of "communist synthesis " or whatever, there's a very good chance you can radicalize them by deflating their idea of capitalism. Try asking them what they think the bourgeoisie do or what they contribute to society.