The most common breach of norms is that I brew almost everything at far weaker ratios than is considered normal; I use a 1:22 or so.
My other big sacrilege is that I tend to enjoy almost any coffee I get my hands on. I can tell the difference, I can appreciate fines coffees from finest farms and roasters - but I can also enjoy far more casual coffees and drinks that would be sniffed at by firmest Specialty sacraments.