"I don't live my life according to you guys or according to what other people think of me," Manziel told a group of reporters after the Browns' organized team activities. "I'm going to live my life to the fullest and continue to be committed to this game and continue to be committed to what I'm doing here -- trying to earn my place in this locker room, with these coaches and this organization.
"If I want to go out and have some fun, and it doesn't hinder what my main goals in life are, then I really don't care what anyone has to say."
Manziel, who was criticized on social media for having a good time in Vegas instead of being buried in his playbook, said his weekend getaway does not affect his approach or his commitment to the Browns.
Manziel's trip, which included ringside seats to the UFC fights at the MGM Grand and a poolside party with New England Patriots tight end Rob Gronkowski, was well documented everywhere from Twitter to his own Instagram account.
"I'm very surprised that it's actually a story,'' he said. "For me, I've accomplished dreams of mine that I never really thought I'd get a chance to be in this position and I've been here every day working extremely hard. I'm coming in here every day trying to earn my place and do what I need to do.
"For me to get a free weekend to spend some time with friends and family of mine, and to have fun and relax and get away from the grind a little bit and then come back when I'm supposed to and get back to work this week and do what I'm supposed to do, I don't really feel that that's a story.
"It was a little bit of a break for us and got to go enjoy it and relax.''
Browns coach Mike Pettine said he advised Manziel to be ready to answer questions, but called the trip a non-issue with the team.
"We're not going to micromanage our players," Pettine said.