"I will not hesitate in taking a critical stand on the process in which demonetisation was implemented," Thackeray told reporters here.
"The way in which a referendum was sought in Britain before its withdrawal from the European Union, a survey is being done here. But seeing people's response, their (UK) Prime Minister chose to step down. Will something similar happen here?" he said.
He said there was no point in Modi becoming emotional at a time when people have tears in their eyes.
"One person cannot take a decision for 125 crore people. Before taking the decision to demonetise the currency, people should have been taken into confidence," he said.
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"Former Prime Minister Manmohan Singh is a renowned economist. Thus, his words and opinions should be taken seriously. The way in which money is being collected, seems that money is being extorted from common man. You have brought tears in the eyes of people who made you come to power with a lot of aspirations," Thackeray said.
Referring to the Reserve Bank's decision not to allow district central co-operative (DCC) banks to exchange the old currency, the Sena chief asked if liquor baron Vijay Mallya had taken loans from these banks.
"Did Vijay Mallya take loans from any of the DCC banks? Banks from which he did take loans, how have they been allowed to exchange the old currency?" he questioned.
Reacting to Uddhav's remarks on demonetisation and the Centre's stand on black money, Mumbai BJP chief Ashish Shelar said the Shiv Sena should clarify where did it stand on the issue.
"Tell us clearly whether you are for black money or against it," he said.
"If you are for black money, the public will sentence you to 'kala pani'," the BJP leader added.