It's understandable how someone explicitly NOT wanting to be your friend would lead to wanting to CTB, I don't blame you for that since I think I've felt that way before at times. Though I think that depending on the person and reason for not wanting to be your friend, it could be the specific dynamic between you two which is for some reason undesirable, or it could just be something to do with them. Because of that, I feel like one should not CTB due to some sort of rejection like that, it's normal unfortunately, you just can't get along with everyone. There's more people who you can connect with and form real friendships with.