A bus with a transphobic message painted on it visited Boston this week, and the mayor responded by raising the transgender flag outside City Hall.

The bus, a project of the National Organization for Marriage (NOM) and Spanish organization CitizenGo, reads:

Boys are boys… and always will be. Girls are girls… and always will be. You can’t change sex. Respect all.

The bus started its tour of the East Coast in Manhattan last week outside the United Nations headquarters. Yesterday, it rolled into Boston where protestors met it.

“Free speech bus. Hate speech bus.” pic.twitter.com/lFdUMnJW9b — Abbi Matheson (@AbbiMatheson) March 30, 2017

Boston mayor Marty Walsh spoke in support of transgender rights at City Hall.

Boston stands with transgender community. pic.twitter.com/kTXYWcRlzr — Abbi Matheson (@AbbiMatheson) March 30, 2017

After the mayor’s speech, the transgender flag was raised.

The bus got spray-painted with the words “trans liberation” in New York City, and at some point yesterday it got vandalized in Boston with the words “#HATE SPEECH.”

I gotta sign off and work but please keep making fun of the Party Bus of Precious Boys for me #FreeSpeechBus pic.twitter.com/S0QP3OUIZs — Faine Greenwood (@faineg) March 30, 2017

Freedom Massachusetts, a transgender organization, released a statement about the bus.