It doesn't even have to be forcefully. Would you at least try to talk/seduce them out of their ways?
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One of the most important parts of a relationship is accepting that both of you have flaws and learning to deal with them. If it's something small like leaving the toothpaste uncapped, that's easy to fix. If it's something bigger like how the respond when you are talking about things you like or how they act around your friends then you need to reevaluate some things.
To answer your question though, no. If there was something really big about them that I didn't like I probably wouldn't be with them. If it requires them to change who they are, no.1