Honestly at this point if the permanent third partyists can't show their work and demonstrate a viable, convincing road map that could propel a vanguard working class party into the national mainstream of electoral politics; then yes get used to being dismissed by people who take the material and sociopolitical conditions of this dying empire seriously

To say nothing of the fact that the actual debate and crux of the struggle is over whether entryism into the Democratic Party will reform it or blow it up

I'm firmly in the camp that says the neoliberals of the DNC will never accept compromise and so will destroy the party at the first sign of a shift toward soc dem (let alone socialist) politics, thereby creating room and a seedbed for sucesssful national-scale third party politics

But to get there from here, requires engaging in electoral politics