The popularity and wrong rumours create hatred:

This increase in popularity of Guru Arjan caused jealousy and grave concern among the strict and fundamentalist Muslims at the Mughal court in Delhi, who started being hostile towards the house of Guru Nanak Dev Ji. This great doubt, concern and wrong suspicion about the Guru in the minds of the Mughal leader was being flamed by the enemies of the house of Nanak.

This was further heightened by the malicious manipulations of Chandu Shah, an influential Hindu banker and revenue official at the Emperor's Darbar (Court) at Lahore. He had once been advised to arrange a marriage of his daughter with Guru Arjan Dev Ji’s only son, Hargobind, but because of his contempt for the Guru, he laughed at such a suggestion using harsh words that eventually were repeated to the Guru.

The Mughal court leaders spread wrong rumour about the Guru to the Mughal leadership; so much so that Emperor Jahangir was totally confused about who the Guru was and what his message was for this world. Read what Emperor Jahangir had written in his diary the "Tuzuk-i-Jahagiri" ( "Memoirs of Jahangir") about the Guru and realise how confused he was:

"In Govindwal, which is on the river Biyah (Beas), there was a Hindu named Arjun, in the garments of sainthood and sanctity, so much so that he had captured many of the simple-hearted of the Hindus, and even of the ignorant and foolish followers of Islam, by his ways and manners, and they had loudly sounded the drum of his holiness. They called him Guru, and from all sides stupid people crowded to worship and manifest complete faith in him. For three or four generations (of spiritual successors) they had kept this shop warm. Many times it occurred to me to put a stop to this vain affair or to bring him into the assembly of the people of Islam."