Despite sounding like it's zero-sum, fighting for the consumer is actually the only way to lift everybody up. Fighting for workers specifically is playing favorites. Fighting for the ownership class is also playing favorites. Focusing on consumers makes everybody a winner over time.
"Fighting for workers" means "don't have child labour", and "don't have machines that regularly amputate people's limbs", and those types of things.
And "fighting for the consumer" is how we ended up with low-wage countries with little safety regulations making our stuff, and occasionally dying for it. This is also how we ended up with all sorts of other negative externalities ranging from worker exploitation to environmental impact.
You can't capture reality in simplistic one-liners.
Workers are consumers. A healthier working class and a more even distribution of wealth provides increased purchasing power. If all you can see is what you'd lose and not imagine what you'd gain, that's a fault of imagination, not the proposal.
I feel like you're arguing against me, but I could also take your comment verbatim and feel like it backs up my side. Favoring consumers means everybody gets their fair share.