I'm going to say a tattoo can't be in honor of someone who didn't like tattoos
Why would you say that to someone?
I think it's silly for them to get a tattoo of someone who was staunchly against them.
You shouldn't tell people what to do without any good reason behind it. I am sure you wouldn't like it if someone does that to you.
But I think they're making a mistake.
It isn't your place to tell someone else that their choice about what to do with their own body is a mistake. If you don't like their tattoo, then you should just ignore it.