ethical vegans (and not people who eat plant-based for nutritional reasons, and often get conflated with people doing it for ethics reasons) generally agree on one very simple rule:

To reduce, as much as possible, the suffering inflicted upon animals.

That's it.

Where that line is drawn of course depends on your personal circumstances. Some people require life-saving medicine that includes animal products, and are generally still considered vegan.

I'd like to see what about this confuses you and your epistomology [sic, and that word doesn't mean what you think it means]