Stepmom offended by FB pic. Was aked to remove it.?

My mom and dad got divorced several yrs ago. My dad remarried. My stepmom and bio mom dont go near each other. I posted a pic of myself about age 5 and my mom and dad on FB i hadnt seen the pic b4 and thought it was cute. My parents were standin side by side, not holding hands or kissing or looking at each other. Looks like it was at the lake. NEways, it offended my step mom beacuse my bio mom was in it and i was asked to take it off FB. I am an adult. I live on my own. But am i wrong or is it not fair of her to ask me to not share MY pics of me when i was little just bc my bio mom is in it? I was already moved out when my parents divorced and when my dad remarried. Am i wrong? Am i suppose to dispose of my pics just bc my bio mom is in them. What about when i get married or have kids. Please help!! I did not post it to upset her either. But its like anything to do with my mom should not exist. yeah the divorce was messy but whos isnt? Thats alot of history. According to her my bio mom hurt my dad and thats why she doesnt like her. i thought my relationship was good between my step mom and i. Is she going over board?