Totally agree with you Princess L. I won't tolerate it. No phone call...No answer!
If I have to pop in on someone all of a sudden, I'll sit in the car and call from my cell phone, and unless previously planned, i won't expect to be let into their home like that. You never know what ...or who they're doing, and it's rude IMO.
I can't walk into anyone's place. I even feel uncomfortable if I knock and someone says "Come In". I used to have a key to my sister's place, and when she was home, I expected her to come and answer the door for me.