I am going to say no the floor person does not have a right to do so, they should not ever get involved with a player agreement which may only be implied, and which technically may be breaking law.
The house by getting involved here is getting onto a very slippery slope. A blind is a bet, a second blind is a call. You have a bet and a call you have a pot. Unless the game is a hi-lo game, you are never allowed to split a pot. This is not a rule this is typically law written in code in most gaming agencies. And while we all chop blinds from time to time it does not change that it is splitting a pot and simply not allowed under law. If a house wants to get involved here, and someone wants to make an issue out of it, the house has no win so to speak. They can't enforce a ruling that has no basis in the rules, and forces a player to act not an accordance with law.
If you were to go in front of a judge, saying this guy chopped a blind with me and then he had a hand and didn't chop, I lost money I want it back. The only defense needed was to point out that chopping pots is illegal. The blind chopper has no case. By the same token the house should simply not let floor people mediate a blind chopping dispute between players other then to simply say that blind chopping is technically not allowed and I can never force a player to chop.