When one follows a certain set of beliefs, be it a religion, a dietary choice or any sort of lifestyle that includes specifics on what is appropriate to do i.e. rules. When you're breaking those appropriate behaviors you're being a bad
As Christians, I know we forget. We forget that it isn't about the rules. There is such a fine line between legalism and "sinning so that grace may abound." It's difficult to not let your "Standard of Identity" be influenced by rules, regulations and outside opinions. There's too much emphasis on expectations put on yourself, expectations put upon by others.
Even though I have slowly added to my dairy intake, I still call myself Vegan. Not because I necessarily follow the stringency of these rules, but because I continue to be influenced by the philosophy of one. My heart is still there.
And that is all that matters.