I tend to not tell my friends about it mostly because they really don't understand and I can't expect them to. It really only comes up if we are eatting together, but even then I go about my gluten free diet as normal regardless of their comments or sighs of disgust.
I rarely tell my friends about my experiences being glutened and really only disscuss this with my partner who believes and has seen me glutened. I learned at a really young age, when I was chronically ill, that people aren't interested in hearing about illnesses all of the time. Try to find support in other parts of your life, like here because we all know what its like, and accept that your friends will never get it. Hopefully they will tolerate it rather then torment you about your choices.
Honestly, I take the time with my friends, who don't understand my illness, as a chance to disconnect from the way I am feeling or my bad health experiences. It gives me the time to forget about it and focus on other aspects of my life.