At a conference recently, I went over to a table of guys around a computer.
Asked "Whatcha working on, can I join?"
One of them says "It's very complex stuff," with dismissive body language.
Guy I know says "jay can handle it" and makes room for me to sit down.
Yeah, I facilitated multiple sessions at the conference on this, and just spent weeks implementing a related feature.
One rude person doesn't ruin my day anymore, but this type of thing beats down beginners.