Manners are a sensitive awareness of the feelings of others. If you have that awareness, you have good manners, no matter what fork you use.
Emily Post. cf. “It’s not where you take things from — it’s where you take them to.” —Jean-Luc Godard via Jim Jarmusch, Golden Rules of Filming See also: Tim Gunn’s Golden Rules and related, his 5 Ways to Make It in Fashion (e.g., be polite)