Rangers, threatened by relegation from the Northern Counties East League Premier Division, were helped in their fightback as Lee Hill, who scored the Tigers’ opener, was later sent off.
Milligan said: “Everyone is on trial here at the moment. If you don’t want to get fit, if you don’t want to train or play for the badge then you’re at the wrong club.
“I’m fuming to be honest. I do understand that sometimes you need a steady and mature head or two to organise, but if you’re 16 and can do that or you’re 38 and can do that it’s irrelevant.
“I’m afraid just a quarter of the team were at it today and that’s not good enough.£
Mitch Husbands put the Tigers two goals up and then converted a late penalty to make it 3-3.
But a Josh Batty penalty in the final minute completed hat-trick and won it for the visitors. Fraser Hansen pulled the first goal back for Hall Road.
Milligan added: “I thought we were poor all day, we didn’t string five passes together.
“We had chances and never looked like losing, but we didn’t use the ball well enough at all. They were direct and we were looking to play it forward and to feet quickly through the midfield. Maybe we will have to take a look at that.”