You are justifying widespread use of a dehumanizing term by its widespread use. I think, you should revisit your line of reasoning, especially from a historical perspective concerning other terms certain groups were called by.
While whale does not carry a very offensive undertone when you're characterizing a group falling victim to some scheme, it is certainly insulting and dehumanizing when they are your targets, especially when calling individuals as such.
I think you should revisit your emotional reasoning. I explained a term. Your vague comment about "certain groups" names, doesn't add anything to the conversation, nor address anything that I said.
My reasoning is fine. I don't like Facebook, and I don't recommend it, because it is dehumanizing, by nature.
While whale does not carry a very offensive undertone when you're characterizing a group falling victim to some scheme, it is certainly insulting and dehumanizing when they are your targets, especially when calling individuals as such.