I had a very bad experience in gatwick several years ago. The AA staff were very unfriendly and wrong in what they did. I even got the business card from the duty manager who even admitted that even though I was correct, she was unwilling to do anything about it. Becuase I made such a fuss to no avail, I have avoided flying AA into or out of Gatwick since then.

Just the thought that they might remeber me (not very likely) and single me out for more misdeeds becuase of my past encounters is enough to fly another airline if I have to fly into Gatwick.