When I first came out as aro to my friend, she thought I was joking at first, and had to ask for clarification the next day (I have trouble sounding sincere). Once I told her that I was being serious, she didn't seem surprised, and was really supportive
She also probably came out to more people for me than I did, which was kind of weird, but she was really happy for me, and it was easier than me doing it myself, so I didn't mind. She already knew about aromanticism too, so she didn't misrepresent me. I made sure to explain it myself when I came out as grey-ace though, as that's a bit more complicated.
I'm still not out to my parents though. I think that they'll support me, but it just hasn't come up yet.