Don't trust the B on the second bike from the left

So I'm not usually one to rant, but I'm just leaving the gym and I'm quite annoyed.

I live kind of far from my gym (it is close to the school I used to work at which is why I joined, but now that I'm no longer working there it is out of my way). I make an effort to go to spin classes on the weekends, and the Saturday morning class fills up so you need to get there early.

Today, I arrived a half hour early to reserve my bike, then went and did some other stuff in the weights area. I went back in the room about 10 minutes before class to start warming up, and a girl came in and claimed the bike next to me. She started adjusting and asked if I could help her move the handlebars back, but they wouldn't go, so I offered to switch bikes with her since they were in a place that worked for me. She eagerly said yes and so we switched. Then I realized that the seat on the bike I just traded for was stuck back. I said something to hear about it and she said, "oh yeah, I couldn't get that to move either." Then she hopped onto the bike I had just given up

This is the point in the story where I should have asked her to trade back. But there was an open bike right behind my original bike, so I moved back there, and the story gets more complex, since a guy swooped in on the bike with the seat pushed back as soon as I took my towel off the handlebars, and now the class was completely full.

So, when I moved to the bike in the back row, I discovered that the seat would not move up - it kept falling back down. I called the instructor over and asked if she had a way to tighten it, and was told that it had been "broken for weeks." But she told me that I could ride with the seat in the down position if I wanted to. I'm 5'8 - so no, that would actually be a bad idea, and the fact that an instructor suggested that I take the class with bad form is crazy. But that's another story entirely. She was a sub for the regular teacher, but still, no good.

Anyway.

So I (loudly) said to the teacher that since I had given up a working bike in a switch to a bike I didn't know was broken, I guess I would leave. This was all DIRECTLY BEHIND the girl I had traded with, but did she even turn around?? No. She just kept pedaling away. I know she could hear me, I was literally a foot from her.

Now, I realize I could have asked for the bike back, but I wanted to put it on her to do the right thing. Plus, the situation was now that one person would have to leave, since I was no longer on HER original bike, so we couldn't just undo the trade.

I had done something nice in trading and got screwed over in the process, and if I were in her position, I would have offered it back to me, since I had gotten there before her, but she just avoided eye contact.

I did take my frustration out on the elliptical, but still it was annoying and disappointing.

Spin class is cutthroat, y'all. And karma will come back and bite you - or maybe pull your groin. Just saying.