"Nitish Kumar can shake hand with Nawaz Sharif (Pakistan Prime Minister) but refused to wish Namo on his birthday or greet him on his 3rd victory," Sushil Modi said on Twitter.
"Is this kind of untouchability good for Indian politics? What kind of inclusive politics is this? What mentality is this?" he asked.
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Mentioning an earlier unpleasant episode, the senior Bihar BJP leader said "Nitish Kumar was very angry when a photo published in a paper showed Namo & Nitish Kumar raising hand together. Why Nitish Kumar was angry?" he sought to know.
The Bihar CM's exchange of warmth with Advani at National Integration Council meeting in Delhi yesterday, the first after JD(U) broke up with BJP ending 17 years of association on June 16 last, had kicked up political storm in the state.
While, Lalu Prasad's RJD described the parting ways of the JD(U) and BJP as "match fixing" to split secular votes, LJP President Ramvilas Paswan said it was "tacit understanding" between the two parties.
But, Sushil Modi had sought to downplay warm exchange of greetings between Advani and Nitish Kumar describing it as standard practice under political protocol.
However, he did not forget to nudge the latter for expressing cold vibes towards the Gujarat Chief Minister Narendra Modi earlier.
Kumar's party JD(U) had defended its leader saying it was part of "sanskar" (tradition) and no political meaning should be derived from it.