Robinson was substituted at half-time in the 2-0 defeat to St Mirren on Saturday - the second match running in which he was taken off at the break.
Afterwards he admitted to the Edinburgh Evening News that he had played poorly before claiming: "On Saturday there, I think it was a case of 'I'll just pick on him again and take him off'.
"I didn't think I was the poorest out of the midfield four. It has just been me on the day.
"My confidence is now really low again. It's just the case if things are going wrong, I know it will probably be me coming off. That's just the way it is."
But the 21-year-old now admits his emotions had got the better of him following the defeat which leaves the administration-hit club 10 points adrift at the bottom of the Scottish Premiership table.
In a statement on the club's official website, Robinson said: "I was very emotional after Saturday's game and perhaps I should have taken a moment to think about what I was saying.
"Certainly, I was upset about being subbed off but any footballer worth their salt would be too as we just want to be the best all the time.
"I don't feel like the manager's singling me out for unwanted attention, I absolutely know that.
"The gaffer has started me in every single match this season and that wouldn't happen if I were being picked on. I was caught out at a bad moment after the game which is where these headlines have appeared from, but I know that I need to be a bit more clever about what I say in public.
"I'm 100 per cent behind the team and I only want what's best for the club.
"I'd like to apologise to the manager and my team-mates for causing any offence and I want the supporters to know that we are all in it together even if recent headlines have suggested otherwise.
"Their support has been incredible this season and no one is more appreciative of the backing we've all received than me."
Locke has accepted Robinson's apology and said: "I've spoken with Scott and the matter has been dealt with behind closed doors.
"I understand some of Scott's frustrations but anything and everything I do is because I believe it's for the benefit of the team. Lessons have been learned here and we now move on."