Just tell them.

I'm not a vegetarian but I dont eat pork or beef. I do get grief from people. I even have family members give me something I dont eat and tell me its chicken (i do eat chicken). Its disrepectful! I know avoid going to these relatives homes to eat. I once had a co worker put a piece of pork on my plate at lunch. That was the last time I went to lunch with them.

Most people I have encountered are mature and supportive. They are my true friends and family. These are the people are associate with the most. They know they can eat anything they want, just as I can. None of us are rude or disrespectful of each others choices. if they are I cut them from my life.