I would write this off, booze does a lot of nasty stuff . People say things, do things, that they normally do when not drinking. You said a Senior Mang. wasn't impressed . And you did mention it to another member of your work area. I have a feeling this matter will take care of its self.
Normally I avoid work night's out like the plague, but I was coerced into going, they had a bet if I would turn up or not!