Justifiying one's wrong

Q: A boy said to another boy (black) in urdu which spells (kala), I said to him dont do that because Allah has created him. He then said "Qaala Rasoolullahi (sallalahu alayhi wasallam) " He was trying to justify that he didn't say kala (black) But qala (in Arabic) Rasoolullahi sallalahu alayhi wasallam. And he said that something after Qala Rasolullahi salallahu alayhi wasallam like a hadith and I don't know if its a real hadith or not maybe he said "Dont disturb someone" something like that and included saying "Dracula" also... then I asked him which hadith there is written "dracula" and I said to him dont make fun of hadith...

Here he made two mistakes

1. By justifying that he said Qala and not kala by using the means of hadith as I mentioned earlier

2. He said dracula also as I described in which manner he said that. Is he still a Muslim?

Anal sex with wife

Q: I want to know what is the kafara of doing anal sex with your wife when she is in her monthly periods . The husband claims that it was by mistake but the wife said that it was on purpose and this thing happened the second time and the first time both agreed that it was by mistake. I know there is a way in Islam to batch up with your wife if a person does toubah and promises not to do this thing again but what will be the kafarah?

Girl uncovering her hair when a boy comes to propose

Q: We follow a practice in the case of a marriage proposal that first the boys mother comes to see the girl, then both parties make itikhara, if positive, then we go for investigation, meet the boy personally and thereafter when everything appears to be positive, the girl and the boy are shown to each other face to face. My question is that when the girl is shown to the boy after all other steps are done, can she show her hair or uncover her head in front of the boy only with whom she is being proposed to marry?

Mocking someone with a beard

Q: A man started keeping a beard after shaving for a long time. He is a Muslim. My father told me that "to be true he was looking better before"(because that man doesnt really look good after he started keeping a beard) I also agreed with my father saying that he was looking good before because when a man leaves his beard after shaving it for long time, he does not look good but after the beard grows he looks good. I had seen another man (who is a Muslim) who had shaved for a long time then left his beard and he too was not looking good but now he is good looking because of a big beard?

My question is that: Is there any affect on us being Muslims? Because we said that a man is not looking good while he was obeying Allah and His Messenger (sallallahu alaihi wasallam) by leaving a beard.