The fight went the distance and the judges controversially handed Taylor a split decision victory.
Many thought Catterall had done enough to upset the undisputed light-welterweight champion, but the judges had a different view and the scorecards read 112-113, 114-111, 113-112 for Taylor.
BOXXER promoter Ben Shalom admitted he thought Catterall was robbed of the belts.
He told talkSPORT's Fight Night: "I've watched these decisions as a fan and to be part of it is sickening. It was an amazing night.
"The fans in the Hydro were special, it was a special atmosphere.
"What we saw tonight was historic from Jack Catterall. He came, a man from Chorley, 28-year-old and waited two years for this to happen.
"He planned every day. I spoke to Jamie Moore all week, they had the perfect game plan and came and put on a masterclass against the one of the pound-for-pound kings and they've been robbed of all four belts."
In a separate interview with Sky Sports, he admitted he was embarrassed to be promoting the event because of the decision.
talkSPORT host Adam Catterall was ringside for the fight and scored it very different and launched into a fiery rant about how judges need to be held to account as they are 'wrecking careers'.
He said: "I scored that fight, and this is being incredibly conservative. You have to understand that I'm ringside, I'm in the atmosphere, it's pro-Josh Taylor in this arena and everyone is screaming every time he threw a shot.
"When you are a judge, and you are professional, you have got to take all of that into consideration, keep your head in a fridge and judge what you see.
"I scored that, and being pro-Josh Taylor, 114-111 in favour of Jack Catterall. We had a points deduction in there and there was a knockdown too.
"There's people ringside who had it 115-110, some even had it wider saying they could only give three rounds to the undisputed champion.
"Robbery, I don't use it a lot. There's rounds in there that are tight, it was an ugly fight to watch. It was not the most pretty of fights, but robbery is doing it a disservice.
"This kid has come up here, boxed the ears off an elite fighter, put him down, done a fantastic job. He's lived with this for two years, had it pushed back and back, had to delay it as he gave Taylor the opportunity to unify the belts with Ramirez last year and for him to come here and have that done to him… it's one of the worst robberies I've seen up close and in person.
"It has to be the point where the British Boxing Board of Control are holding judges for account. You are wrecking people's careers, you are wrecking people's earning potentials.
"What does Jack Catterall do now? Josh Taylor has just gone on TV and said 'I'm moving up in weight now, there's no need for a rematch'.
"What does he do now?"