I'm sorry if this comes off as ignorant, as I've only started practicing FDS-style dating.
So basically, I met a guy who passed my initial vetting processes. He has pursued consistently, planned thoughtful dates, our values seem to align, no particular red flags in sight... Until he made a few comments which rubbed me the wrong way. I'm vegan, and we were having a discussion about finding vegan options in our city. He mentions how his ex is also vegan and that she also holds X belief about veganism. I have a nose piercing, and he commented that his ex has the same piercing. Those comments were pretty brief, he didn't elaborate or anything. Otherwise, things are generally going well, but I'm treading very carefully and have avoided getting emotionally invested so far.
I would like some FDS wisdom regarding this situation. Is this necessarily a big red flag ?