I liked them before they became popular
A person says this when a group they've been into for ages becomes famous. They feel like they were the only one who saw the potential and now everyone’s just copying them.
They were just a bunch of nobodies before they got famous, and I was the only one who saw it coming.
I was the only one who knew they were going to be famous, and now I’m the only one who still likes them.
Everyone else waited for them to be famous, but I was there from the start.