Am I being harassed at work?

They were celebrating my Birthday at work today and one of my co-workers purposely bought me a carrot cake and put pink candles on it saying, "Since you are a Vegetarian we bought you a carrot cake with two pink candles on it." This was in front of everybody there. Then they started laughing as I blew the candles out and one of them said, "oooh! He blew out BOTH of them." I am a known Vegetarian at work, but the pink candles I'm not getting. What are they trying to imply?