This is so gross ! Why do people do this ?

Their was a question on here and it said that its good notto wear underwear! Thats gross and all the comments wear about how you shouldnt wear underwear ! They said its better for ur vagina to "breath" ? I get what they mean but isnt that wrong ? They make underwear for a reason! And it said u shouldnt wear denim jeans without underwear bu hen what are you suppose to not wear without it like a skirt ? THATS DISCUSTING ! someone please explain i find this ..... Gross does anyone else ?