The old testament also states, "blunt offerings and sacrifices I seek not but a humble and contrite heart I will not spurn." Matt, I do not think there is anything wrong with not eating meat on Friday but what I do not like to see when people use this as being a better Catholics because they do. (Please know I am not referring to you.) Throughout the old and new testament The Lord talks about not boasting about the sacrifice we do but rather clean your face, comb your hair and not to let everyone know but rather by your actions and by the amount of love and compassion you show, is what will please His heart. Sometimes it is a greater sacrifice not to state a word to someone in anger or slander or the like then deny ourselves a certain food because it is such and such a day. Yes they are all good but one preference over another does not make one a better Catholic or a "holier" person.
Example - one may not eat meat on a Friday and yet go out to dinner and be rude to the waitress for whatever error she did in the order. Where does the sacrifice of not eating meat on Friday, become the sacrifice? Rather holding one's tongue and smiling and say thank you takes a lot more of the act of the will then saying, may I have lobster or catfish or a cheese sandwich with a salad.