If someone writes something shitty and you actually address them, most of the time they're just like, "Oh, I'm sorry. I'm a big fan." And they're really nice people. When you're on the Internet, it's people's first instinct to just go after people.
I write characters that are based on elements of people I know and experiences I've really had.
Writing your own jokes, you just kind of keep working on something until you think it might work, and then you try it out and hope for the best.