There is no such thing as having a role stolen from you. The director can cast whoever they want, for whatever reason they want. It's generally not in their best interest to cast someone horribly unqualified (though it does happen) so I seriously doubt in most cases that the director is doing it just to upset you.
Regardless of the actual facts of the situation, it's bad form all around to make a habit of expressing how royally screwed you believe you've been from show to show. I completely believe you, and if I were a director/ casting agent I might even still believe you. But that wouldn't matter because no one wants to cast somebody who openly dwells on getting the short end of the stick.
Of course actors are people too, but the problem with a lot of actors is that they are the KIND of people who will make empty proclamations such as "ACTORS ARE PEOPLE. PEOPLE ARE HUMANS!!!! Understand it!" I won't try and figure out what you're trying to say, but I'm sure your loud actor-y voice sounds excellent saying it.
Hey man, if you're gonna be upset, be upset. Theatre can be a very upsetting thing to be involved in, but you can't rely on it to just get easier because you feel you've paid your dues. There are plenty of us here who have been rejected and screwed over for parts we've "deserved" dozens of times year after year, so don't say no one understands what it's like. Just know that there's no way any of us could still enjoy theatre if we insisted on writing an opera for our tragic lives every time we're turned down. You say you don't give a damn if anyone sides with you or feels sorry for you, well then maybe what you need at times like this is a diary, not a public discussion forum. And if you feel the need to count up the numbers and size of the roles you've had, factoring in whether or not you were listed in the program, it might be time to stop and consider whether you're doing this because you enjoy the experience, or because you enjoy the status of getting a "good role".
"The last train out of any station will not be full of nice guys."
- Dr. Hunter S. Thompson
"I wash my face, then drink beer, then I weep.
Say a prayer and induce insincere self-abuse,
till I'm fast asleep"- In Trousers