If I say *Comcast* are you going to be able to track me down? No. There are millions of Comcast subscribers. Even if it was an ISP of 1 customer, that still isn't personal information. If the ISP happens to leak the customer information from social engineering, that's on the ISP, not me.
All ASNs are considered to be public information. You are required by internet registry rules to be listed in a public database for everyone to see. As far as I can tell, most people would agree that listing stats like this is not considered personal information.
I did not joke about it in any way. I showed people a list to demonstrate that we had a lot of users from Asia yet they did not use our servers in Asia. Even if I did joke about it, it still doesn't make this personal information.