The hostility is entirely unnecessary. If you eat out and don’t tip, the only person you’re hurting is the person you claim to want to help. If you can’t tip, eat at home. If you can, then do so while still fighting for better workers rights. It’s really not a difficult concept to grasp.
If you’re picking it up yourself, I think tipping is unnecessary. If it’s being delivered, I always make a point to save enough for a tip.