Scheduling phone calls and who calls whom?

Should the requester call the person?
Does hierarchy play any role in this?

I once had a semi-harsh if snarky rebuttal from a colleague when I asked for a meeting and then set it up over outlook having her call me so she could call when she was ready. She quickly had me change the meeting to me calling her since I requested it. She acted as if I was living under a rock and was insulting people if it did it differently.

I never thought much about that, even thought I though I was being more accommodating to her schedule.

Now I'm on the opposite end of the scenario and I don't know if this person is breaking "well know protocol". It really doesn't seem like a big deal but I was so sharply corrected I'm curious to know what the general thoughts are on such etiquette.