I wouldn’t say the correction is necessarily pedantic because non voters’ opinions do count and matter, but it also doesn’t materially change the argument. Calling the majority of people (millions) who voted in an election “batshit crazy” translates to, it’s not possible to rationally disagree with me, everyone who does must be crazy. A totally immature, unproductive though sadly common mindset that we should make a conscious effort to avoid.

Moreover it suggests the holder hasn’t thought through the position of the opposition which in turn means they really don’t deeply understand even their own convictions.

If millions of people agree about something, there’s a rational explanation.