"What we're about is building an implementation period, which is to build a bridge to a future where we work well together," said Brexit minister David Davis.
"And I do not think it was in good faith to publish a document with frankly discourteous language, and actually implying that they could arbitrarily terminate, in effect, the implementation period.
"That's not what the aim of this exercise is, it's not in good faith, and we think it's unwise to publish that."
Britain and the EU began talks this week on plans for a two-year transition period after Brexit, during which London must follow all EU laws without having any decision-making powers, in exchange for frictionless access to the single market.
A draft EU agreement published on Wednesday calls for the ability to sanction Britain in cases in which it would take too long to refer any breach of those rules to the EU's top court.
That could include reimposing tariffs or customs checks, both of which Britain is supposed to be free of as a member of the EU internal market during the transition to December 2020.
"I thought that document was hardly a legal document, it was a political document," Davis said in London.
Pro-Brexit British lawmakers were quick to jump on the plans, saying it would be "utterly perverse" of the EU to impose tariffs on British goods when the two economies are so closely aligned.
The government initially gave a muted response, saying only that it was a draft document that reflected the EU's stated directives.
May and her top ministers held a committee meeting over two days on Wednesday and Thursday in a bid to thrash out their substantial differences over the future relationship with Brussels.
Davis said the atmosphere was "very constructive, a lot of things resolved", while adding: "There's still progress to be made."
He said the framework of what Britain wanted had already been set out: "that is an overarching free trade agreement and large numbers of components of what we want to achieve within that, a customs agreement and so on, and we were fleshing that out".
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)