To your latter point, that is coming from what Jesus said, if indeed he actually did say that and was not attributed to him later, and was the way he, or his followers, excused Jews from keeping kosher.
I choose to follow Judaism’s laws, and maintaining kashrut is one of them. It ties me to my people, and my heritage, and the values taught in my religion. I especially appreciate the compassion behind separating fleish and milk.
I once made a new recipe, boiling meat in coconut milk (which is NOT milk), and it just looked so…..so…..wrong. I was boiling the flesh of an animal in what appeared to be the milk that nurtured it in life. I never made that recipe again.