I used to enjoy painting my nails as a kid until my abusive grandma got around to that. I honestly would like to start up again but getting past those memories is pretty hard.
The only real cure is to pave over the top of bad memories with good memories. I love green and set my partner to work finding me decent colours for her/I to use, even her mother randomly got me some green polish for a birthday. They need to stop though, I do not use with any amount of frequency that I will get through it all.