Steel sharpens steel is largely manosphere nonsense. Add the virtue signalling call out and you're halfway to a silence-the-folks-I-ostensibly-agree-with-via-criticism-of-their-tactics bingo.

If it were true that folks don't respond to pithy statements and emotionally driven discourse, politics would look like a bunch of Al Gores with competing powerpoints. It sure as hell does not.

Is this sign going to change the mind of a bigot? No. Might it signal to them that many folks are tired of hearing their bullshit? Yes, especially for the less virulent among them. Might it make a trans person riding the train in a society that increasingly feels like it's closing in to deny their very existence feel better and less alone? Abso-fucking-lutely.