Invisapeeps 2.0

Had an interaction with a grumpy old man today. I was hosting a private pool party at the pool club we belong to. The regular pool hours ended at 6 and our party started at 6. Well it was about 6:15 or so and some old man pulls up right in front of the gate in a non parking space in his truck and gets out. He goes in straight to the bathroom. Which that did not really bother me. But then he came out and just stood there for awhile watching the kids play and looking at us. So I thought maybe he was confused about the pool hours or looking for someone or something. 

I asked him "Can I help you?" He was like "I am a member here and I came to use the facilities if that is all right with you"  I said "Okay we are having a private party right now."  He was very grumpy and said "I am not trying to come to  your little kiddie party blah blah". Then grumped off. My Dad got pissed and said something about him being a pedophile. I kinda got an odd vibe off of him too since he was not even supposed to be there and was just standing there watching the kids in the pool. Then got pissed when I tried to ask what he was doing. He left and then apparently came back or sat in his truck awhile from what I understood from someone else at the party. 

Why on earth would you come to the pool after hours just to use the bathroom? It was odd. But if he just used it and left I would have thought nothing of it, but then to stick around and watch kids and then get super defensive when someone talks to you came off really odd. 

Sometimes I don't understand people.