They are morons, somebody not worthy of my friendship. Ask them what hobby they have then insult them about something they like to do.
I find it funny how people utterly obsess over hobbies then look down on the others on their choice of hobby. I've heard that type of comment. Make me think of this...
Caution Extreme Sarcasm!!!
You're cyclist? Only a cross-dressing, goof ball would dress up in spandex to ride a bike. Do you get to paid to look like a clown on a bike? What's more fun strutting around in those tight shorts or riding the bike?
You're weight lifter? Only a lunk head, narcissist, would drink protein shakes and work out 7-14 times a week. You know when you stop that you'll just be a big and flabby old man. Do you know you'll have wasted a bunch of time grunting groaning without having sex?
You're into toddler and tiaras? Only a woman with an insatiable need for attention, dresses their 4 year old daughter to look like an adult for beauty contests. What comes first your needs or your kids needs? Good to know you put on a show for the local pedophiles!!!
Pick, a hobby, pick a character flaw, and stereotype of the hobby and attach a good insult.