Bamford joined Burnley on loan in the summer but saw his spell cut short last month after failing to score in his six appearances for the club.
The 23-year-old, who also struggled on top-flight loans at Crystal Palace and Norwich, returned to Chelsea and was sold to Middlesbrough in a £6million deal.
And the former England Under-21 international has suggested a spat with Dyche could be the reason for his failed time at Burnley.
"Dyche said that because I had come through at Chelsea – and because of the way I had been brought up – I had never had to work for anything," he told the Daily Mail.
"My background is irrelevant and I didn't even come through at Chelsea. I started at Nottingham Forest cleaning toilets and scrubbing the shower floors.
"So saying I didn't want it enough was upsetting. I went home every night wondering how to get in the Burnley team.
"It was: 'You've been brought up nicely, had everything handed to you'.
"People think I don't mind that much but for me not playing is the hardest thing ever. Sitting in the stands has been a nightmare."