"We are in 2021, where the pride movement is all about celebration, 'you be you'. It doesn't matter what you believe in, you should be celebrated. You believe what you want. That's fine.
"It's not about necessarily the LBGT community, it's about everybody."
The sign advertises the city's annual Pride Picnic that was scheduled to be held on Sunday but has since been cancelled due to Covid-19 restrictions.
The tag line for the event is "Embrace, accept, celebrate".
Gray- Lockhart said it was particularly hurtful the vandalism was done in the week specifically aimed to celebrate pride in diversity, especially when events such as the picnic had to be cancelled.
"It's appalling, disheartening and disappointing."
The sign was the only one Gray-Lockhart knew of to have been vandalised.