'Abusive' (or 'hostile,' which in this context I take to mean the same thing) does not seem to me a very clear standard - and I do not think clarity is at all increased by adding the adverb objectively or by appealing to a reasonable person's notion of what the vague word means.

Harris v. Forklift Systems, Inc., 510 U.S. 17 (1993) (concurring)

Harris v. Forklift Sys., 510 U.S. 17 (1993).[law.cornell.edu]