Some entrepreneurs complain when investors don't reply to their emails...
They believe this is because they aren't from IIT or IIM, or assume that investors are arrogant and rude, and bad mouth them on social media.
This is a loser's attitude.
Maybe your email is confusing and unclear? Or has typos and is badly designed, which leaves the investor with a poor first impression of your abilities.
Think of this as just one of the many hurdles you need to cross in order to run a startup successfully.
Blaming someone else doesn't really help your cause at all! Learning to take ownership and accepting responsibility for your actions is the first rule of entrepreneurship.