PHILADELPHIA — The mother who posted a video of her daughter and niece after they were were seemingly snubbed by a costumed character at Sesame Place spoke out Tuesday, saying the incident was “disgusting” and “unbelievable” and pressed to hold Sesame Street accountable. Over the weekend, an employee dressed as the turquoise muppet Rosita was recorded appearing to refuse to high-five two young Black girls during a parade at Sesame Place in Langhorne. The video, recorded by Jodi Brown, spread on social media and prompted calls to boycott Sesame Place and for an explanation from the company. The…