I am strict about it. Entertainment is a luxury that I can choose to avoid for any reason. I love HP, but i have chosen to black list it. Just as i have Kanye West. I do not separate art from the artist. This notion doesn't even make sense to me. The art comes from the life and experience from the artist no matter how talented. It's not an on/off switch where the artist switches themselves off when creating their art.
I'm a graphic designer myself and I can tell you that when I create designs, my personality, my uniqueness, my influence, my outlook, me, myself, and I all go into that design, even if they are subconsciously. Therefore, that design is not a separate entity, it is me in a sense.
I'm curious how "strict" strict is. My guess is the problematic person needs to be the main creative force behind that particular thing? The Harry Potter movies: void those, or is the fact it's an adaptation add enough additional people to the mix that's it's sufficiently separated from the originals?
I include HP movies and any other HP licensed products as strict. Only because JK Rolling is financially benefiting from them and they are still from her work.