My mother calls my baby Vegetable...how can I stop her?

My mother calls one of my babies Vegetable.  She says it’s because he is round and plump and juicy.  My sister says it’s because she likes to irritate me.   You know – push buttons to get a reaction.  In that way my mother and I are quite similar; I too can be confrontational for the sake of the conversation it may spark.  However, she tends to be too Stiff Upper Lip, and avoids conversations about love and fears and hopes and emotions.  You know, all the kinds of things new mothers need and want to talk about.  I'll ask her about her pregnancies or how long I was nursed, or something like that and 9 times out of 10 she'll say - "Oh, I can't remember that!"  But she can recall, in detail, how one of her children learned to crawl, or something funny we said.  Am I the only mama who retains both good and bad memories?  Is there something wrong with holding on to difficult situations for the lessons they teach?  Or, to paraphrase Big Boi (Antwan Patton) in Flip Flop Rock - Am I on a whole 'nother plane and a whole different lane?  Is my kind of motherhood a whole 'nother game that I'm playin'?  Yo, Mummy, can't you understand what I'm sayin'?  Hmmmm...you can see  one of the reasons why I need a blog. 
 
Anyway, my mother and I are constantly having the same conversation about that annoying name, Vegetable. True, the little sweetie is round and plump like good garden produce should be, but I find the nick name “vegetable” to be rather insulting. The other day, when she trotted out her - “Hello Vegetable!  How is my little Veggie today?  Veggie veggie veggie-matic” I said exactly this – “Please don’t call him Vegetable.  It bothers me and I don’t like it.  I am sure you can think of a better name for him.”  She replied – “But I like calling him Vegetable.” 

 Have I mentioned she’s a therapist?