Currently, I'm known as the meme man that draws chinese cartoons.
My school has a study room for senior students, and in that study room is a retractable wall of whiteboards. Whenever I feel like it, I draw something elaborate and stupid on them - people don't seem to mind them so far.
An acquaintance of mine thinks that the chinese cartoons I draw are mortal sin and will sometimes try to hunt me down if he stays back after school (Quote: "If you stop now, you can still go to heaven.")
On the subject of telling people I draw things - I don't make too much of a fuss over it, and since I used to draw very often in the earlier years of high school, I'm pretty much known as the guy that can draw.
One thing I've learned is that, if you know how to deal with them, people don't annoy you so much if they know you can draw. Whenever someone asked me to draw them, I'd draw a trashy doodle of them as a joke - they're happy enough with just something like that.