Technically speaking, judging people based on their physical appearance is “frowned upon”. But is it really so evil to assume that your professor with meticulously groomed sideburns absolutely pronounces the “h” in “why”? I think not.
In this spirit, additional indicators of pretentious pronunciation habits include, but are not limited to: goatees, sweater vests, and argyle patterning. Professors who pronounce the “h” in “why” also likely: pronounce non-English food item names in the native accent, are assholes, and swear by David Foster Wallace’s classic novel Infinite Jest.