This is wrong and a person who does this is sinful. Wearing jeans and tight clothes does not nullify Islam.

Is it correct to judge people to be kaafirs if they dress like them .for example girls who wear jeans and t shirts in the streets?

Sins | March 16, 2014 10:13 am
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How to differentiate between sin and shirk (especially major shirk) Example:1# If a person does many haram acts because of his desire and continues it without fearing Allah then will it be just a sin or it will be considered as he is following his desire _is it shirk as mentioned in Quran [45:23] “Have you seen he who has taken as his god his [own] desire, and Allah has sent him astray due to knowledge and has set a seal upon his hearing and his heart and put over his vision a veil? So who will guide him after Allah? Then will you not be reminded?”……………………….. 2# We know interest is haram. If a person continues to take interest after knowing it haram or does not pay zakat _does it mean that he loves money more than Allah and doing shirk as mentioned in hadith _“He who became the slave of the Dinar or the Dirham will perish and be destroyed.” [Hadith Bukhari]SO are these just sin or they are shirk or they may lead to shirk even major shirk?
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I wanted to ask regarding backbiting.Sometimes, when I am with my mum, she might be eager to tell me a story. Before she even starts getting in to the details, I have this feeling that she is going to backbite a person. This may happen with my friends also.They know that I do not like backbiting. But, my mother would probably say to me that she is just telling me something, and my freind might say too me that she is not going to name the person, she just wants to tell me her experience. So where are the boundaries? How will I know when to stop them so they stop backbiting?