One of those who tweeted him was author Twinkle Khanna, daughter of the actor's Bobby heroine Dimple Kapadia, and Mr Kapoor tweeted back.
Sorry Twinkle, find someone else to 'bully':
Happy birthday @chintskap uncle ! May you get older, wiser and stop troubling Neetu aunty so much :)? Twinkle Khanna (@mrsfunnybones) September 4, 2016
Thank you. Neetu ko toh baad mein dekh loonga first you stop bullying me! https://t.co/xfaxN69YQy? Rishi Kapoor (@chintskap) September 4, 2016
Now 64, Rishi Kapoor might be older but possibly not wiser - at least in Twitter humour, which his million plus followers often don't get. We certainly didn't get this joke about Kim Kardashian and a bag of onions.
Onions in a mesh bag! pic.twitter.com/YXCXPJV3iN? Rishi Kapoor (@chintskap) August 7, 2016
Last seen in Kapoor And Sons, the actor hasn't signed a new film yet - that we know of.