See post 190. Romans 14:14 I am convinced, being fully persuaded in the Lord Jesus, that nothing is unclean in itself. But if anyone regards something as unclean, then for that person it is unclean.
...well for that person's perception ...it is unclean...but, that does not change the controlling scripture.
Example..I know a person who believes he must face the east in prayer. That is his persuasion but, scripture is not altered by that individual assessment.