Tan Dhesi, who became Labour's MP for Slough in June, was accused of ignoring the plight of a British Sikh man who was arrested during his visit to India.
But Dhesi vowed to continue working for the whole public "regardless of background, colour or creed" rather than focussing on just one community, The Sun reported.
The abuse came after Dhesi won the right to speak at Prime Minister's Questions and used the slot to ask about a rail link in his local area.
One troll wrote to the MP saying: "...A Sikh British citizen is being tortured in Punjab and you're worried about rail. You have no response to that. You need a slap upside your head you fake Sikh!"
Dhesi reacted with fury and pointed out that he has repeatedly worked on Johal's case.
"It's hard enough serving as an MP without having to face constant abuse from various quarters (whether that's the far- right/extremists/others who feel that I'm only interested in 'my community's issues', or those from within my 'own' community who feel I don't do enough)," he wrote on Facebook.
"I am not merely a Sikh MP/representative speaking solely on Sikh issues," Dhesi added.
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