"Use" vs "abuse" is generally an ideological choice, not really related to the actual use of a substance. If someone uses the word "abuse" in situations like that, it's clear that they are a prohibitionist, to whom all use is abuse.

Of course, egregious examples can very well be classed as abuse. But if someone classifies examples like the one you reference as abuse, then they're a prohibitionist, plain and simple.