Most people actually agree on the same thing once you get down into the details of abortion. For some reason everyone likes to lump themselves into "pro-life" or "pro-choice" camps and then argue about the extreme takes from either side.
https://news.gallup.com/poll/321143/americans-stand-abortion.aspx
Downvoting means something different to everyone. It could just be that they felt you didn't add to the conversation well with a simple LOL and some emojis.
Some people downvote whenever they see an emoji.
I doubt anyone is downvoting because they "disagree" with you on this case, since the one user that actually downvoted the post didn't even downvote you.
I would just ignore these downvotes and move on.