The problem with pistachio is that there are a lot of bad pistachio ice creams and gelatos (IMHO). There's really an art to getting it to where it both isn't bitter and isn't too sweet. Ben & Jerry's for example is typically way, way too sweet (in any flavour). There are a couple of exceptions but I can't eat B&J's Pistachio. YMMV.
My particular poison is pistachio of hazelnut gelato. In both cases with correct balance you get something with a nutty, creamy flavour.
It's not something I had until I was an adult so it's not a childhood thing either.
At this point, everything Ben & Jerry's has way to much sugar/corn syrup/whatever.
The point of old school Ben & Jerry's was way too much cream. Apparently, that has gotten too expensive or too perishable for an industrial cold chain.
So years ago there used to be a gelato shop in the West Village called L'Arte del Gelato on the corner of Barrow St and 7th Ave if memory serves. It was right next to the Christopher St subway station and the place would actually shake when the trains went through.
They had an amazing pistachio gelato.
Years ago now the owners had some kind of split. I never knew the details but it resulted in that store changing its name. I honestly forget what to now. It's gone. But the other owner (I guess?) opened a store under the original name in Chelsea Market, which is still there today. I haven't been there in some years but I believe the pistachio gelato is the same. I would definitely recommend trying that.
This might be a case where people genetically taste things differently, because pistachio ice cream wasn't an acquired taste for me at all. Just seems delicious, though maybe a hair off the map of the kind of taste you usually get in ice cream.