Why Lithuanians are against litvaks?

I am an American, and I can’t understand why Lithuanians are so much against litvaks and why you want Lithuania to be abolished. The post war jews were beaten and arrested by russians and the fact that Lithuanians were very poor after the war and were forced to speak Russian and not their mother language, it’s not a reason to beat jews. Have you never seen what did Russians did in Ukraine??