Use greek letters and dingbats. Or even all these emoji that are cluttering up unicode these days!
Seriously people! Isn't assuming the only thing .bro could imply is the 'Bro' culture the true horribly sexist attitude? I would use .bro and not .br on principle against that alone.
The last time I encountered this level of explicitly-willfull-stupidity in the human race it was taking witchcraft testimony from a horse. And I am pretty sure the people making the PC fuss are exactly the types who would have kept themselves occupied in centuries past having women they didn't like the look or sound of burned alive 'for their own good'! These NUSes* are not interested in bettering the human condition and are a major part of what is holding it back.
*Nus, noun - from a Sherry S. Tepper novel - Acronym: 'No Useful Skills'. Used to describe people with that attribute.