I have a couple of questions.

When did this person's hobby become your property to cast your whims upon?

If you succeed at proving that they're incompetent, incapable, just holding it wrong, or whatever: Then what? How would this finding improve anyone's situation -- at all, anywhere?

This is a super weird argument you are making. I’m not sure you’ve been part of a family or community with people of different likes or dislikes. Or maybe just want to argue about something do you choose this thread to go down. I suggest you abandon it.

My partner would say the plants in our household are mine, because I am responsible for them and they want no part in our responsibility of dealing with their care.