Importance of Sticking to Plans

Last week, I made dinner plans with someone for Sunday night at 7:30 at Olive Garden in Tyson's Corner. Around 6PM on Sunday, she called me and said something about her not having her car at the time and asked me if we could move it to around 8:30 or so. I dislike people who do that, almost like a girl "playing a game" and "testing how much crap I will take". I told her "that's a little too late for me, we can reschedule if you'd like", and left it at that (which we actually did later on). She politely apologized for it.

I just finished talking with my best female friend on the phone and she thinks I'm wrong on this one. Her exact words are "It's just like you, Paul. You think everyone out there is trying to take advantage of you, and you find something wrong with every person and quickly diss them".

Open question to all: Am I wrong on this one? Should I just put up with more (than currently level of) crap women give me and accept it in order to "have a healthy relationship", whether if it's friendship or anything else? Or should I keep my current "Take no crap from no-one early, or she will always think I'm a pushover and not respect me" attitude?