IMO, a very bad idea.
I recall a scene with a very cute blonde with a nice body who was doing a great job throughout.
Then, at the end with a face full of jiz and on the floor near a full length mirrir, the shithead who just did her has the balls to say something along the lines, "just look at yourself. Aren't you proud to see what you look like, bitch?"
That took me down from a satisfying scene to feelings of empathetic sadness for the girl who did her best only to be verbally degraded by the stiff who just got his rocks off. It turned me off totally.
Meanness for no reason is stupid and unnecessary.