Childish response by Imran. Modi is well within his right to decline any invitation - that does not make him a 'small man'.
Furthermore, he also needs to understand that there cannot be any peace talks with India as long as we do not stop fighting the war of Kashmiris. It is India's internal dispute and we should not be poking our green nose in Kashmir.
Stop funding insurgencies and terrorism in Kashmir and get your troops out of there, and India will be more than willing to engage in peace talks. However, that is against the interests of the military (the actual rulers of the country) and Imran cannot dare to defy them if he is to keep his office.
You cannot have peace talks with India or any other country on your terms and by making irrational demands. Pakistan's idea of resolving issues with India, i.e. ceding control of J&K will never come to fruition, so the ball is in Pakistan's court now.
They have to decide whether they want continue to fight this win-less and fruitless war that has yielded zero benefit to Pakistan over the last 70+ years, and has been nothing but an economic and political burden, or swallow their pride and withdraw their soldiers and freedom fighters (terrorists) and start a new chapter with India that can actually benefit Pakistan greatly. Hollow pride will not take any country anywhere, and it has certainly not taken Pakistan anywhere.
Nonetheless, any government that tried to initiate peace talks with India before the elections was dubbed "Modi ka yaar". What has changed now?