Paris Jackson's firing back at people online who are criticizing her Paris Fashion Week look ... asking why they're so uncomfortable with the human body -- and pointing out we see other naked animals all the time.

The daughter of Michael Jackson shared a series of videos to social media ... calling out people online for hating on her Paris Fashion Week Outfit -- a sheer gown which didn't hide her breasts or her crotch.

While Paris' outfit was far from the only risqué one at the event, she felt like she was taking a ton of flak online ... which she says she doesn't get 'cause everyone has a body.

You can listen to PJ's argument for yourself ... but, she says that humans are just animals -- and no one has an issue with the naked form of other animals, so they shouldn't take issue with seeing another human's naked form.

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Jackson does admit she may have gone a bit too far with that analysis ... but, adds there are simply bigger fish to fry -- and, she encourages people to help do something positive for the environment instead of worrying about her clothes.

Paris Fashion Week always brings out the wildest styles ... and, we've got a gallery featuring the best of them. Click to see every out there outfit from last week.

Bottom line ... Jackson's ensemble may upset some people -- but, she just doesn't see what the big deal is.