Goodness, poor Dr. Bill is getting "what for" on an innocent remark ... just goes to show that -- with this bunch -- not even remarkable age gets you cut any slack!
Now, dear Whit brings up a good point about intelligence and acting/singing etc : Just consider this : you may have 50 or 60 pages of dialogue to memorize, you have to listen to other actors and respond with appropriate facial and body gestures, you have to remember your lines while following directions as to where to sit, stand, move, when and to where...and possibly, all the while, managing a Period Costume and even a wig ... and then, if it's film you have to "hit the marks" ...
Wait a minute! Why would anyone ... ah, yes, the money??
Is this what's called a circular arguement?