Maycee Barber is a confident young woman. So much so that the 21-year-old Barber, who has already stated she wants to beat Jon Jones’ record for youngest UFC champion (23), got some brushback this week, when she said she can beat current champions Valentina Shevchenko and Zhang Weili already. But it isn’t boasting if you you can back it up. And the unbeaten Barber (8-0 MMA, 3-0 UFC) added a significant name to her list on Friday night when she ran through the previously red-hot Gillian Robertson at UFC on ESPN 6. The time of the TKO stoppage in the flyweight main-card opener at TD Garden in Boston was 3:04 of the opening round. “I feel great.