I think that the "prissy" business is/was just a pointed remark about the playing style of somebody who the original poster just didn't like very much.

I think that's probably true. But what did it actually mean other than "I didn't like that"? We can speculate that it means various things - over pretty, fussy, lacking in emotion and mechanical have all turned up in the thread. But the word "prissy" doesn't really help pin down what was meant.