Honestly, at that size and age (assuming <1 year old), I'd be shocked if any of the breeders on here suggested it was breeding interest... most males don't until they're 2 or 3 years old or at least 500-600 grams from what I've seen explained hefore. He just isn't sexually mature enough to have the urges yet...
It could just be he's picky and hoping to wait you out to get live rodents. It sounds like he has only taken frozen once? Is there possibly anything you did differently that one time from the rest? (Him in a hide rather than roaming, specific level of darkness in the room, warmer weather or ambient temps that day, wet vs dry rodent, etc.)
It sounds like you are feeding mice (weaned rats would be way too big for a 133g snake) and you just say rodents rather than rats or mice in the post. Is this the same as the breeder fed? And are the frozen the same species (mice & mice vs live mice & frozen rats)?
I had an adult male, fed live for years before me, who refused frozen entirely for a while and I managed to get him to switch to frozen by scenting with gerbil bedding on the first one. That may be worth a try if you can get some from a store.
Though, losing only 1 gram is basically a non-issue. I wouldn't even begin to worry unless he dropped below 110g, so I'd just wait him out on the frozen since he has taken before. Just don't offer constantly... if he refuses, wait a week.
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