I want to advance my knowledge of algorithms and data structures, and sometimes I study them at work when there's nothing to do, because I usually do things fast and no one needs my help.
A lot of times when 2 of my colleagues go and have their smoke break, they approach me, see some math symbols on my computer and start laughing. This annoys the heck out of me, because I don't understand what they're laughing at. Like they laugh, and go away talking about this, probably saying: "Oh, he's studying algorithms again".
How do I deal with this situation? I want to stop them from laughing at me.