@womaninthedark Yes, I would have agreed with you until I started wearing men's shoes and noticed female same-sex couples checking and discussing my footwear to assess my status
Seriously, have another look at your shoes and make sure you haven't accidentally written "I'm" and "gay" on them, because your experience frankly sounds bonkers. When I'm out with my girlfriend we're not staring a feet, keeping a running commentary as we hunt for other lesbians hidden among the crowd.
I wouldn't even expect to be able to spot another lesbian unless she's with her partner or at a specific event. Most lesbians don't have a particular look, and the fashions stereotypically associated with lesbians (short hair, bright dyed hair, dungerees, DMs or masculine shoes, plaid shirts, rainbow stuff, etc) are widespread everywhere because they're practical/trendy/just look great; it's pointless to make an assumption from them. You'd be doing it all day and wrong half the time.
Although, if someone has gone to the effort to go dapper butch I might make an appreciative comment, but that's an aesthetic that takes waaay more work than slapping on a pair of men's shoes.