When I flew the guppy at America West we called it a guppy. When I came over to United my first airplane was a guppy.
When I flew DC-8's they were called cable carts or Dinosaur 8's nobody got their little feel feels hurt by that. If calling the 737 a guppy hurts your little feel feels maybe you need to look deep inside your soul and find your inner masculinity. Or take plan B and just get over it.
Kind of one of those first world problems like this...
For a full explanation look here.
First World Problems - YouTube