I use them -but I generally use the short version (I'm lazy), while AI likes the long version (which is correct -my version is not).

You don't use em dashes then, you use en dash.

pixl97 11 hours ago | parent | next [-]

I think they are saying they are using an en dash where they should use an em dash.

	▲	ChrisMarshallNY 11 hours ago \| parent [-]
		Yup. Note that I didn't name the dash.

Mordisquitos 11 hours ago | parent | prev | next [-]

They don't use the en dash, at least not in their comment—they are using the hyphen-minus as en dash–em dash substitute.

JKCalhoun 7 hours ago | parent | prev [-]

(Looks more like a tee-dash to me.)