Me:
single parent with sole responsibility for dd, house, garden, dog, shopping, meals, bills, etc
working (albeit in a job with completely flexible hours)
volunteer several hours a week
Her:
Married
Both she and her dh stay home, and are effectively retired (don't work by choice)
No children, no pets, no commitments outside the home
Hobbies: cooking and walking group (2x per week with friends)
I spend my days juggling various obligations, and have 'windows' of time when I am free to talk and give her my undivided attention (vs multi-tasking - i.e., calling her while I walk the supermarket aisles). But, she is almost never able to talk, and the reasons are usually ludicrous/laughable: 'I'm folding laundry, can I ring you back' or 'I'm cleaning up from lunch can I ring you back' or 'I'm putting away the shopping, let me ring you back' or 'I'm in the garden, and need to ring you in a few minutes'.
I absolutely do not expect she should always be available when I call. But, I make time to speak to her and frankly find it insulting that her laundry/dishes/plants, etc take priority. She is completely focused on whatever she is doing, and it can never wait.
To be fair, she always does ring back - but by that time, my 'window of time' has closed, and i am often unavailable (in a meeting, collecting dd from school, on a conference call, etc), and we play phone tag endlessly.
So, go ahead and tell me IABU. Or is she? Btw, her solution is that we pre-arrange times to talk so she can plan for it in her day.