I think there's a big reason why treating them the same way they treat others is fine.
The people that Nazis target are not only usually innocent, but they often don't even have a choice in the reason for their bullying. You don't choose to be non-white, be gay, be trans, etc.
Nazis choose to be pieces of shit that hurt innocent people.
The argument that people bring up for not treating them badly is that we don't want to set a precedent in case the Nazis eventually get in control and decide being on the left is worthy of being deprived your rights.
But I think we all know that they wouldn't need a precedent to deprive you of your rights if they took control and didn't like you. They would simply do it if they had the power.
I always chose to let my brother cut. Then, even if they were perfect halves, I still laughed like a maniac and acted like one piece was clearly better.