I was getting on my commute and no seats were left so I had to ask for the Jumpseat. Captain was in the galley and I showed him my pass and credentials and he’s like oh man I don’t need to see any of that just come on up. I walk in to introduce myself to the FIRST OFFICER and he says, “oh you’re the guy who mean mugged me in the terminal.” I stood there thinking to myself holy sh*t what? I didn’t even see any pilots walking to the gate. Then he looks over at the captain saying, “ya a damn regional jockey giving me the stink eye. Better watch who you do that to never know when you’ll be in their Jumpseat.” Captain and I looked at each other saying WTF? He was a total dick to me the rest of the 2 hour commute. Hope I never have to fly with someone like that at a major airline one day.. so ya maybe a simple middle finger to that guy woulda been the appropriate pilot wave that day.