I rarely use “whom” when I should. Even when spell check suggests “whom,” I think it sounds pretentious. So I don’t use it.
And I’m sure some people then think, “What a bozo.”
And that’s a problem, because just like that one misspelled word that gets a resumé tossed into the “nope” pile, using one wrong word can negatively impact your entire message.
Fair or unfair, it happens.
The author is right. People do judge you for grammar mistakes and misspellings, and Inc.’s article lists some of the biggest culprits (adverse/averse, elicit/illicit, and insure/ensure, to name a few). Check it out to find which ones you may be using incorrectly and follow the tips for how to remember the correct usage.
But why did I find this particular list worthy of a link?