No you don't. If you do, just don't be that guy :)
1. proselytism 2. grammatical solecism 3. inflating the value of a "downvote"
In hindsight, I should have kept my mouth shut. But hit those three before my caffeine deficiency has been addressed, and I'll likely find myself in _that_ role.
Is there any other kind? I will admit the whom-bomb was unpleasant.
OP: If the answer is not him/her the question is probably not "whom."