You are entitled to your opinion.
However, when anything in the Torah, can mean anything you want, then the words really mean nothing.
G-D prohibited the eating of non kosher foods. That is part of jewish law.
You can think a rock symbolizes an apple or whatever you want, however, that's not part of the Torah.
The Torah tells us (jews) what to do, we don't tell G-D (from his in the Torah) what it should say.
Then why do you not do what God tells you to do in Isaiah 55:3 by clearly showing you (Jews) that food is a metaphor for teaching?
Listen to me and you shall live.
Life is the promise for obedience to the law.
The teaching that the concern of God is about food is the flesh of unclean beasts that do not ruminate, at all.
Now you know what the argument was about and why Jesus pissed off, embarrassed and confounded to no end so many experts of the law who obsessed over diet and fashion but whose bellies were full of baloney.
Now that is not kosher.