Preferred: RBK embraces all kinds of people and encourages everyone to be their self.
Negotiated: Everyone can change and RBK encouraged people to always be the best they can be.
Oppositional: RBK endorses and encourages criminal behaviour.
Preferred: It is important to have strong opinions and stand by them.
Negotiated: We should be brave and state opinions even if other people disagree.
Oppositional: Kapernick is foolish and ungrateful for his career as he is easily throwing them away just to say his opinion.
I believe that these adverts do provide evidence for the idea that audiences are free to interpret messages in a variety of ways, including rejecting them, but can also disprove it.
Reception theory is evidenced by these adverts to a degree, as it is possible for different interpretations to be drawn from all sorts of media, whether it be video advertisements, television programmes, posters etc. As seen by my own interpretations from the Reebok advert, I found it quite easy to draw multiple different readings from the poster, with ideas accepting the ideas attempting to be portrayed by the brand, and almost meeting the brand halfway by offering a different interpretation that doesn't accept the desired message at face value, but also doesn't quite reject those ideas, but instead takes in both sides to come to a somewhat neutral conclusion. However, as the Reebok advert does contain some possibly controversial content, it makes it very easy to draw out negative conclusions to the brand, rejecting the ideas that Reebok are trying to portray and instead making different conclusions about the advert, completely separate from what the brand want everyone to see about them.
However, the reception theory is also disproved as, seen at least in the Nike advert it was much easier to draw the intended conclusions that the brand wanted to portray from it, rather than the negative views which were harder to interpret. Some Media texts can be formed in such a way that only the desired reading is able to be taken away from it, using such specific ways of communication through whatever material they are creating, that it would be extremely hard to pick the media apart to find a way to reject the views that the creator is trying to convey.
One way in which this can be achieved is through outright saying what the producer is trying to portray to the receiver, to remove all ambiguity regarding what they are trying to say by being direct towards their audience. Although, this effect is very hard to achieve, as no matter what, something is usually able to be taken a different way in which we intended, no matter how hard we try for that not to happen, with Stuart Hall's reception theory being mostly proved true ; if it were able to be disproved, we as humans would be going against our natural instinct to question anything and everything rather than passively accepting it.