system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How do things grow on you mentally? Why can you start to like something over time that you initially hated or disliked?

For example: I got a half finished cross-stitch kit from my MIL that was produced in 1982. I HATED the colors as of last Sunday - all dusty roses, grey-blues and browns. As I worked on it yesterday I realized I now think the colors are nice and look good together. What happened??
gpt
It could be that you're avoiding cognitive dissonance - if you're going to work on it, it doesn't make sense not to like it. 

It could also have to do with an inherent human dislike or mistrust of new things if they don't fit any existing categories or "schema" that we have. It's like a kind of "stranger danger" reaction. But as the new thing becomes familiar, we can better assess whether we like it or not.