Just laugh
How many times has someone shown you a meme or a video on your phone that you have seen a million times before? You just want to pull your eyes out of your head and tell them that you have already seen it and can’t look at it again if your life depended on it.
Well, it may come as a surprise, but if you want to be more favorable to that person, the best thing to do is to just go with it and laugh with them, or at least smile. This is the best way to connect with someone instead of rejecting their offer and coming off as short and rude.