"Whom" has been consistently misused (or, rather, not used when it should be) since before pervasive home internet. Not only are you being an annoying pedant, but you're picking something that many people have consistently gotten wrong long before the social media crazy you bemoan.
If there's a sense of wrongness in its usage, it's for the good that it's promptly corrected when such instances noticed. Rather than a mere spelling difference, using the incorrect grammatical case damages meaning and causes momentary confusion (but sure, humans can recover the meaning). You can bemoan it being pedantic and annoying, but the structure of language aids understanding. The more it's corrected, one'd hope, the less it's repeated or get normalized.
As Dr. Sheldon Cooper said, "if you don't tell them, how would they learn?".
