Barstool Sports co-founder Dave Portnoy has vehemently denied accusations of rough sex with women as young as 19 and says he’s scared of cancel culture.  Two women accused Portnoy, 44, – who has been linked to three sex tapes – of filming them without consent, choking them and spitting on them, reported.The women accusing him have not been identified. Portnoy denies the claims, saying he was the victim of an eight-month 'witch hunt’. He posted a 10-minute video to Twitter…