Having said this, I find it counter-productive, judgemental and sectarian to exclude people based on an examination and micro-management of their lifestyle.
I also find it counter-productive, judgemental and sectarian how obsessed a lot of "vegans" are with the word "vegan". Everything is vegan this and vegan that. Vegan ..... vegan .... veganism.... vegan vegan.
If you order food when going out, the word "vegan" is super useful.
If you want to be part of an exclusive club of people who make the same choices as you, the word "vegan" is spot on. Or... ideally, an inclusive vegetarian association or vegan society aiming at promoting an animal friendly diet.
If you want to title an article about animal liberation, or if you want to advertise an organisation that fights for animal rights, or if you want to organise an action to help animals, then the word "vegan" is entirely unnecessary and immensely problematic. Why? Because it means that it's for vegans only. Because it means that it is something for those who have a specific lifestyle. Because it means that it's all about veganism.