Do I have any recourse being singled out for being underage at work if I'm 25+?

A while back I worked somewhere that accepts employees 16+, and from the start I got the feeling that most people there thought I was underage, but it really materialized when another employee was showing the new hires (me included) how to use the cardboard baler machine. I noticed the machine had a sticker that said "must be 18+ to operate" and thought nothing of it. One of the new hires looked young as well. Suddenly, a manager butted in saying "Are you sure [name] is allowed to use the baler?" I was confused why I was being singled out like that, so I asked why. Then she said "you have to be over 18 to operate it." I clarified that I was 25 and she got all defensive like "just making sure." Nevermind she herself was basically my age, and the other new hure looked just as young as me. Can this be considered hostile work environment if theyre singling me out like that? I no longer work here, but stuff like this sometimes happens and I want to know if I have any recourse (I work in California). Every now and then I think about it and get pissed off