It's 2019 can we please stop the stupid?

[Brian37]

I can swim in the sea, am I a fish??

Not the point. Huge difference between nomenclature and scientific classification.

Fish and mammals both swim in the ocean, but fish are always fish and mammals are always mammals.

And regardless, I think some, maybe not you, but some may be missing the point in my original post. The Tweeter refused to call the dolphin a mammal and got angry that someone said it was a mammal.