Learning party = new to the fight / still on the early phases.
Clear party = phase 3, already cleared or very close to clearing.
Farm party = a party that has cleared at least a few times, and is able to consistently clear it with minimal failed attempts.
If someone who has stepped into the fight once or twice, maybe seen phase 2, regardless how soon after the patch it is - They do not belong in a farm party.
People progress at different speeds. Some beat the fight within hours after the patch simply because that's their main priority. If they make a farming PF and you just unlocked it, then move right along and don't bother.
It is completely inconsiderate to waste the time of 7 other players, if you are not prepared for what the party expects of you when it is bluntly advertised.
There is nothing "elitist" about this.