The backlash that a lot of 'plus-size' (by fashion industry standards) bloggers and models (also see actors, performers, etc.) face tends to be based around the idea that being bigger is unhealthy and therefore by being themselves in the public sphere without shame they are somehow promoting poor health. The idea that health can only be gauged by an arbitrary number on a scale or label on a dress is a reflection of our bizarre obsession with appearance and it's very narrow judgement (which is bad news for everyone, large or small). A person's health is individual to the person and it's measurement should be based on a whole range of aspects to do with their quality of life. Humans can be weird about this stuff - we are very into the idea of using shame to reinforce 'correct' behaviour and demonise 'deviant' behaviour, which can be useful for stuff like, y'know, crime, but damaging for stuff like how women or men should manipulate their bodies to meet a series of capricious beauty ideals.
So try to ignore magazines, adverts or people telling you that you are not perfect - no-one is meant to be and who gets to decide what perfect even means?! But your self-esteem and attitude can be FLAWLESS - focus on being healthy, happy and living a good life. To quote another song - Enjoy yourself, it's later than you think.