Dress Code for some and not for others

I had an issue getting into Cracker Zac's last Friday because of their dress code. I was apparently fine, except for my Crocs. They had a sign that read "No sandals (Men)" and as far as I understand, Crocs are not sandals as my toes were covered. If they do not allow Crocs, they should explicitly specify that. Furthermore, the dress code said smart casual, but there were people in crop tops and tights. I don't appreciate how the dress code is bent for some and not for others. Be specific about what's allowed and what's not.