In many culture or dance scenes rejections are very normal. If you are a single male going to dance at a place where no one knows you, in some dance scenes you will face a few rejections.
Girls or guys will say rejections are because you cannot dance or you smell bad or you are creepy.
Watch the guys who gets rejected. Tell us back if any of these are true.
There are types of rejections.
1) She is very happy that you asked her. She will still reject you to test you.
2) She is avoiding you. She is happy that you did not ask. She does not want to dance with you. She is actively avoiding being asked by you.
3) She does not know you. She already had a few dances or there are many guys interested in dancing with her. She rejects you because of the odds.
Girls just feel more comfortable with some guys. Being nice, being empathetic to girls or other guys would not help.
Things that I have found useful is described below ( I have used the term "you", its applicable to me as well).
1) Go take the class and most girls in the class will dance with you if you danced with them during a rotation.
She already danced with you for the rotation. Even if you are a horrible dancer, she has already accepted you. Most likely she will do it again.
2) Once girls in the class are dancing with you other girls will dance with you regardless of your dance skills.
3) If you are going to a social where a couple of girls know you then all the girls will dance with you,
4) A black list does not work(specially if male to female ratio is high). Asking the same girl a few times almost always work (Girls reward these guys, they ask for dances from these guys later, because they are sure these guys like them). They like being asked multiple times. Watch how latin/italian/greek guys chase girls. Salsa scenes are influenced by that.
5) Many times the girl will say I am taking a rest. If you do not wait for her she might take it as a rejection. If you wait for her and her favorite dancer asks her she might break all the laws and dance with him. You can put her in the black list in girls' dictionary the other guy made her dance and you did not. Rules are based on ballroom dance etiquette. It does not go well with salsa. Latin girls will not follow the ballroom etiquette. Other girls will follow their behavior
6) Girls are passive. Many girls who come to the dance floor are single. They have love-interest (no matter how vague or distant it is).
7) Dance schools may have a different culture than latin socials. Even in dance schools you may be the most popular guy among the girls and some day many girls may be annoyed at you for no reason.
8) Some circles have a high female to male ratio and girls do not reject as much. Popular girls will still reject a few guys