**** you.
How do you pluralize date. It's like saying informations/baggages/luggages and so on. The point is that data can either be singular or plural in usage. You have no right whatsoever to correct anybody regarding how they use or construct their written English. Your (physiologyguy) written English is atrocious and internationally unacceptable.
It (Data) occurs in two constructions: as a plural noun (like earnings), taking a plural verb and plural modifiers (as these, many, a few) but not cardinal numbers, and serving as a referent for plural pronouns (as they, them); and as an abstract mass noun (like information), taking a singular verb and singular modifiers (as this, much, little), and being referred to by a singular pronoun (it). Both constructions are standard. The plural construction is more common in print, evidently because the house style of several publishers mandates it.