The other day I was running an event with about 40 people in the room. When I walked in, this guy looked at me and let out a wolf whistle. I'm quite sure it was directed at me since he was looking my way, there was no one else near me, and it coincided with when I walked in the room. I was professionally and appropriately dressed with nothing revealed. I had on my bright yellow lisbon shirt and silver grey lisbon jacket, black vest, dark trousers and black shoes.
I definitely was the most dramatically dressed person in the room but I found the whistle to be inappropriate and very unprofessional. Fortunately people were busy talking to each other so I don't think many noticed what was going on and I chose to ignore him.
It's been a couple of decades since I've been whistled at. Does anyone have any thoughts on how best to deal with this should I run into something like this in the future? And what to do had it been at a time when the whole room would have noticed - would have been harder to ignore in that case.
I should note that this was a three and half day event - so however I responded, I would have to still be running the event with him there for the whole duration. Also, he didn't say or do anything else inappropriate towards me for the rest of the time - if he had, I would have talked to him one on one to nip it in the bud. Lastly, he's from a country in western Europe though has lived and worked in the U.S. in a senior role for many years.
Thanks!