Amy Schumer is dismissing the gossip that she and Chris Fischer are dunzo in the most Amy way -- a no-BS Instagram post. Check out the video she shared on her page Monday ... it's a house tour her 6-year-old son Gene filmed with text overlay to address the recent chatter. She immediately brings up her recent ringless IG pics, noting ... "I never wear jewelry." At another spot on the video, she cheekily adds ... "Whatever ends up happening with Chris has nothing to do with weight loss or autism …