UK's Equality and Human Rights Commission (EHRC) in a letter called for "accurate information and respectful debate" from politicians in the wake of Britain's referendum to leave the European Union (EU).
"We are concerned that attacks on supporters of both sides of the Brexit debate have polarised many parts of the country," the EHRC letter said.
"There are those who used, and continue to use, public concern about immigration policy and the economy to legitimise hate. The vast majority of people who voted to leave the EU did so because they believe it is best for Britain and not because they are intolerant of others," it said.
The EHRC, an independent statutory body which advises on equality and human rights law, states that "politicians of all sides should be aware of the effect on national mood of their words and policies" even when those policies are not acted upon - like the government's now-abandoned proposal for companies to list foreign workers.
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"Robust discussion is a central pillar of our democracy and nothing should be done to undermine freedom of expression. The right to free and fair elections supported by accurate information and respectful debate is also essential to our democratic process," the letter said.
"Our elected representatives and the media should reflect and foster the best values in our society and engage people on contentious issues in a responsible and considered way," it added.
parliamentary approval but a legal challenge concluded in the UK Supreme Court earlier this week directed her to acquire the consent of both Houses of British Parliament.
MPs will debate the new Bill on Tuesday and Wednesday, the government has announced, with a third day of debate and a vote on February 8. It will then go to the House of Lords to be discussed.
The government hopes this process can take place smoothly for the May to adhere to her declared timetable of wanting to officially notify the EU of Britain's exit plans by the end of March.
The Opposition MPs have also expressed their frustration that they will have just few days to debate the bill in Parliament.