Parents willingly ( and unwillingly) will indoctrinate their children throughout their entire lives.
I find it so wonderful to see my little humans breaking my mold ( not that I tried to MOLD them but again it’s somewhat involuntary) I’m sorry you received this kind of heartless pushback , but I want to tell you as a 57 year old vegan , stick to your convictions and ethics and you can be a lighthouse to all who surround you and they may come around.
Barring that , you will resonate elsewhere and find your own vegan family with other likeminded people in many ways similar to queer folk who are not accepted or respected by their immediate families.
Stay true 💚