Jesus proclaimed that he was the bread of life. He told the people that through him was eternal life. 
They murmured against Him. 
But that didn’t change who He was, His purpose or the effect He had on those who believed.
Most likely there have been people that you’ve shared your testimony/calling/vision with that have been doubtful or rude. Don’t let their snickering affect you. Keep pressing forward in what the Lord has given you. 
Someone is going to benefit from your light shining for Him.