He was speaking at a seminar organised by the Rashtriya Dalit Adhikar Manch to mark the first anniversary of Una Dalit flogging incident.
Kumar also attacked Modi's "Vibrant Gujarat" event saying the "vibration" was only felt by "Adani and Ambani."
"Modi's achhe din exists only on Twitter. But we need a policy and not just Twitter," he said.
Condemning the Amarnath terror attack, Kumar said Modi's promise that demonetisation will end terror attacks was a sham and he should explain why surgical strike did not end such attacks.
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"I condemn any form of violence, but the claim that demonetisation will stop terror strikes has been belied. What kind of surgical strike was conducted when it cannot stop terror attacks," he said.
He also appealed to Muslims not to fear the present BJP government saying "even if Modi tries to be Hitler, Muslims here are not Jews."
He said while the BJP talks about Bharat Mata, the government cannot even provide free sanitary napkins to school girls, and in fact, imposes GST on it.
Kumar also suggested that BJP nominating Ram Nath Kovind as presidential candidate is a "conspiracy" against Dalits.
The seminar was organised to condemn attacks by cow vigilantes, with organisers saying that they want to create more awareness against caste-based violence, rising cases of lynching and terror unleashed by cow vigilantes.
They claimed that the agitation carried out by them in the wake of the incident has created awareness about the horrors of caste-based violence and attack on Dalits and Muslims in the name of protecting cows.
Kanhaiya Kumar too will be participating in this march.