Why must people be negative about our post and pictures??

I dont understand. It seems like everything I post someone has to say something rude and uncalled for. It upsets me because I am excited about being pregnant an this all is amazing. I just don't understand why people have to say negative things about people's pictures or about the way the feel about themselves. Not everybody is comfortable in their skin rite now. Just think if u have something negative to say just dont. For some this is exciting an amazing an some ppl are struggling. We shld be helping each other not destroying each other. Just wish ppl wld grow up. We have feelings an being pregnant mine are out of control. My mom always said if I dnt have anything nice to say then dont say anything.