Just some thoughts, feel free to ignore.
When you don't have non-veg, and are simply indifferent to those who do or even support their food habits, you might not stand by their values but you stand by their right to have a choice. Even feminism, is about choice. I'd not want to be a homemaker but if a woman does want it, it's wholly her prerogative, even if being financially dependent on a man can be nothing short of distress (the spike in crime rates recently really makes me doubt the institution of marriage and humanity, but then again that could be just me). To dress a certain way is choice, your diet a choice, all that you consume is a choice. Even god gives us free will, to make our own choices and eventually reap the consequences. In all of this, no other human is involved. It's plainly between the aatma and the paramatma, the former being a speck of what the almighty is. The soul has its own journey, and shares no real bond with another soul, apart from, well, karmic ones.
So sometimes, we have to realize that even though and when someone IS wrong, we have to be mere spectators (so as long as a third party isn't being harmed in the process. Then one must intervene. Sometimes, one's actions affect those around them too, and that is unfair, innit?). Everything is nuanced.
And sometimes people are just not worth the energy you spend on them. Let them have a choice, and you make yours not just not to thwart them, but also let them learn their lesson their way. Morning dawns on all of us at different times. Our journeys are all different, and there needs to be an inherent soft spot in us for each other. Perspectives may vary, opinions may differ, and fueds may spark. But at the end, we have similar goals. And if you're someone who cannot stand something very different, do not at least go for harsh words, silence is a more potent thing in such times.
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