Eh? The important distinction is that 'sniper' is - and always has been - a role and isn't just restricted to a single type of gun. I've certainly seen posts where it gets confusing as to which people are actually referring to (even with the correct context). Call it a bolt action rifle, a rifle, a sniper rifle, a boomstick - whatever takes your fancy. Just don't call them both 'snipers' because that makes zero sense.
Pedantic would be someone saying 'oh actually it's a carbine and not a full-length rifle, so don't call it a rifle'. Correcting genuinely non-distinctive COD-talk like using 'sniper' as two vastly different nouns? That's not pedantic.
You'd look at me as though I was god damn retarded if I called my M249 'support'.