The Bees had over 30 shots on target and Frank said: "I think this performance was one or two levels higher than the 4-0 win against them.
"That's the interesting thing in football, why it's so strange and difficult to manage and understand sometimes.
But what a performance and I hope all the fans are really proud of the team; we are playing against a more or less full-strength Manchester United team. We've got our entire back four out, we've got our loan left-back out, we've got our captain out - but we destroyed Man United in many ways, 31 shots.
I'm so, so, so happy that we got at least a point; if not, I probably would have lost faith in the football Gods!
"But how we are not getting three points today is incredible."
Frank added: "I know we have lost too many games, but the performances have been better than the points we have got, there's no doubt about that. There are reasons, there are mistakes, and there are margins, that's football, unfortunately, sometimes.
But it's been coming and there's been a lot of good performances... so we just need to keep going and, with all these setbacks and the struggles this team has been through.
Being this dominant today, going down 1-0, but to then come back and equalise; the character, the mentality in the team, wow."