The 36-year-old is less than a fortnight away from his heavyweight grudge fight with Bellew at The O2 on March 4, live on Sky Sports Box Office, and intends to maintain his social schedule with a trip to the Brit Awards.
Haye has returned from a training camp in Miami, while Bellew based himself at trainer David Coldwell's gym in Rotherham, and the Liverpudlian has mocked his rival's jet-setting lifestyle and fondness for celebrity events.
But Haye insists he would maintain the same approach to training for a fight against current IBF champion Joshua.
He told Sky Sports News HQ: "I have heard him say I would go to the opening of an envelope. I think he's just jealous because he doesn't get invites to anything, because he's just a real dull character. A moaning, negative, dark clouds around him guy.
"If I was fighting Anthony Joshua, I would be doing exactly the same training, because I believe this works for me. The training of old doesn't work for me any more. My body breaks down.
"This type of training where you incorporate fun, happiness, sun rises, sunbathing - this works for me and you'll see come fight night, the difference between a happy athlete and an angry athlete."
Haye marked his comeback with two routine stoppage victories last year and believes he is physically and mentally stronger after a break from the sport.
"People look at that gap as a negative, I look at it as a positive," said Haye. "I've had time to reflect on my training, reflect on how I live my life. What makes me happy, what makes me sad. What training sessions went well and why they went well.
"I've had a lot of time to reflect on my career and that's culminated in me being standing right here, knowing exactly what needs to be done in training camp to get the best out of myself.
"Although I haven't fought in competitive fights for five years, I'm fresh, I haven't taken any big punches, my body is in good condition and I'm ready to go. I feel like I've got a whole career ahead of me."
