I empathize and agree with a lot of your points. I see where your coming from. I do find a lot of “bro” talk to come across really cringe.

However, I think you are making an error by banning people for it. If ultimately you’re goal is to build communities and have interesting conversations, then banning people for what is socially widely accepted removes the ability to build connections and learn from others from a wide swath of people. You are essentially quarantining yourself and closing yourself off from others by drawing very innocuous lines in the sand. You’re limiting your community to only people that are okay with incredibly controlled language and incredibly controlled communities. This diminishes your ability to learn from others, have interesting conversations, and be challenged by new information. A lot of people that might otherwise want to make a connection with you, will find such a strict line so ridiculous they will discount everything else you say because they find you to be so unreasonable.

Also, not everyone uses bro as a deminisher or even gendered, many people do see themselves as being siblings to everyone, all humans are family and saying “bro” is a way of reminding others that we are all connected. You are ultimately harming yourself more than anyone else.