Ah, gift giving. I come from a big family and I have always enjoyed the gift selection process. What I do that's mustachian is the way I acquire the gifts. I'm on the lookout all year. I volunteer at the library book sales and often see brand-new looking titles that I know someone will enjoy. I grab them for the princely sum of $1 or less. I often make large quantities of a single item that I can give to a lot of people. I made holiday mix tapes from albums one year. I did a second one when I got a cd player. Now, everybody and their cat have holiday albums, but it wasn't so then. People still tell me they play them every year. Another time, I was working for an office products company. I had tons of samples and rounded out the selection with items from the dollar store. I wrapped them in cool wire baskets, also from the dollar store. I still see those baskets and mechanical pencils at friend's houses all these years later.
Okay, here's the point: Mustachianism does not require one to be a scrooge or a miser. It helps you reach your financial goals in style, without depriving you, your family or your community of the things that you determine are important.
Over time, I notice I have fewer and fewer spendy friends. For those that are in my circle for other reasons (say a board or community activity) I simply avoid the topic. In fact, now that I am FIRE, it's sometimes quite amusing to listen to them, but I never, ever preach about mustachianism. By being careful about who and how I share it, I have had mostly positive responses.