Similar to Southerner Here, I've lived in Beaumont and New Orleans and been poked at for being the skinny kid. First week had a guy come up and ask me where I was from since I clearly wasn't from the area due to my size (5'10" 150lbs). Everyone is just larger due to all the fried seafood around. Cajuns are some funny great people and you gotta have your wits about you. Sharpen that tongue of yours, make a few jokes back, and you'll be fine. Run a few local races to show coworkers your talent and why you are so skinny. I won two local 5ks in a modest time of 17min and everyone at work recognized me for that instead. I'm sure everyone means well, so try not to take too much offense.