Given the challenge of its definition, subjective or collective interpretation is a major component of veganism. Similar approaches can be taken to various degrees of rabbinic kosher law, as well as Islamic halal lawfulness.

generally most vegans (including myself) are adopting the diet for health as well as compassion, although many use it just as well as a cudgel to denigrate people over social media.

If I am cooking the food, it is vegan. If I am eating out with friends, I will make every effort to find a vegan option, however I will acquiesce to a vegetarian option if none are available as I understand the nature of the diet ive chosen. Most vegans refer to this as 'the paris exception' coined by peter singer.