That's the culture of most IT compaies and huge MNCs, I have been through that and ended up quitting my current job. My advise just keep climbing, keep learning, growing and adapting. Since success will always bring you respect. If you keep working harder than the people who just know how to undermine others you will end up above them one day or another. Just remember this experience you had and make sure you don't end up like them, treat you're juniors with respect no matter how high up the ladder you are.
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That's the culture of most IT compaies and huge MNCs, I have been through that and ended up quitting my current job. My advise just keep climbing, keep learning, growing and adapting. Since success will always bring you respect. If you keep working harder than the people who just know how to undermine others you will end up above them one day or another. Just remember this experience you had and make sure you don't end up like them, treat you're juniors with respect no matter how high up the ladder you are.