Sorry if I made a scence just people dont need to be jerks about things, always has to be some smart a$$ comments.
Don't worry about it dude, I wouldn't even give him that satasfaction.  Sure, its a Beretta but you like it and thats all that matters.  In my experience, no matter what kind of car you have someone will make a comment like that.  For example, about a year and a half ago I bought a 1969 Camaro (my dream car).  I didn't even have it a month and someone asked me "why would you want an old Camaro, thats what everyone wants?"  They bascially accused me of just getting it because it is a popular model (so, I wasn't being original), they never even considered that it might have been the car of my dreams.  
So, with people who make comments like that-you just can't win.  If you get a super popular model you get accused of trying to be "part of the fab" or not being original.  If you get a lesser popular model, you get comments like "its a beretta....................... "  Therefore, don't worry about them.  Don't even acknowledge them.  I have been around modified a customized cars for a long time, I there are many things that I really don't like.  But I never make destructive comments like that to the people who built them, there just isn't a good reason to.