"Their perspective is likely that the coworker had already asked them out and been told no, now they're making another overture, and they work together so it's extra aggravating that they weren't respecting the original no."

Yeah, you know why that's likely their perspective? Because it is the literal facts on the ground.

LW, you absolutely know the difference between "wait, you work for Large Company? wild, me too, what department?" and "I have plausible deniability about Caitlin from Accounting right? right? RIGHT?"