Jax Tayloris being slammed after implying that vaccinations caused his two-year-old son with Brittany Cartwright’s regression, RadarOnline.com has learned. The Valley star, 44, made the claims on social media after he and his estranged wife shared that their toddler Cruz “stopped talking” during a recent episode of their new Bravo show. While they did not mention vaccinations on The Valley, the now estranged couple allowed cameras to film Cruz with his speech therapist. Fans immediately applauded Taylor and Cartwright for being so open about their child’s development struggles — that is, until…