I don't think there's anything wrong with people calling it whatever they want! We get the idea and know what they mean
It's the same thing when people say Q-Tips... We know what it is even though it is a BRAND and not the actual thing they are referring too (cotton swabs)
Or when I was younger parents would call everything 'Nintendo' even if it was a Playstation


Or people who call any kind of cereal 'corn flakes' or chips 'cheetos' or 'doritos'
I could go on and on


Personally I keep it accurate and call them banana plants