Why is BJP being allowed to run as a party?

They said Sonia Gandhi can't be prime minister because she's Italian which is racist and and had also said some bad things about Muslim's in this day and age does India want a party which is old fashioned backwards and run by old men? Look how unjust it is they are racist and know one can change that if you put into modern day context what if Obama's oppsition party said he can't run for president because hes black? I know that wouldn't have been tolerated there so why is it being tolerated here in India?