are you sure you know what happened within the 13 years muslims lived in Mekkah ??<quoted text>
They were still far more tolerant that Islamic rulers would have been (or Christian) as they never stopped him preaching in the streets to pilgrims.
But remember, as far as the Meccan's were concerned, Muhammad was trying to convert their friends and families into a faith they considered false. That makes people angry.
don't you know that the immigration to Al Medina wasn't the first immigration done by Muslims, they also had to immigrate to Al Habasha in order to live in peace, so Quraysh wasn't able to kill Mohammed because of his tribe (Banu hashim) position in Mekkah and because of his uncle the leader of Quraysh but that didn't stop them from harming weak Muslims, many were killed and tortured.
a group of Muslims immigrated to Al Habasha (Abyssinia) as they were ruled by a christian leader who was known for his justice and honesty (Al Najashi)
for more info you can check this article
the other tribes couldn't stop Mohammed so they accused him of being a liar, magician and mad, and killed and tortured weak muslims such as slaves and people who don't descend from important tribes to harm the message of Islam and stop it from spreading, after that Quraysh declared a public boycott against the clan of Banu Hashim in order to put pressure on the clan to withdraw its protection from Muhammad, the terms imposed on Banu Hashim, as reported by Ibn Ishaq, were "that no one should marry their women nor give women for them to marry; and that no one should either buy from them or sell to them, and when they agreed on that they wrote it in a deed." The boycott lasted for two or three years but eventually collapsed mainly because it was not achieving its purpose and had caused extreme privation and the sympathizers within the Quraysh finally united to annul the agreement, furthermore the boycott of Banu Hashim was a source of great troubles for the Muslims, and they were forced to do their second migration to an area called Shib Abi Talib where they suffered hunger since no one should either buy from them or sell to them.
during the Boycott Mohammed's uncle, chief protector and the leader of Banu Hashim passed away, so then the leaders of some clans gathered to discuss the issue of Mohammed knowing that everything they tried before created nothing but increasing numbers of Muslims, so they decided to kill him in away that guarantees no revenge from Banu Hashim Clan and agreed on bringing a man from several clans and kill Mohammed with one strike thus his blood will be lost because apparently Quraysh wouldn't be able to take revenge from a bunch of clans all together, they headed to his house to kill him but didn't find him and found Ali his cousin lying in his bed instead, as Mohammed was already on the way to Medina, it didn't stop there as The Quraish announced a reward of 100 camels for anyone who tracked Muhammad and Abu Bakr and bring him dead or alive, you can see further details in the story of suraqa Bin Malik who pursued Mohammed when he was on his way to Medina and was able to find him since he was a clever and patient tracker who trailed people by their footprints on the sand, the excreta of the camels and horses.
you can read the rest of the story of suraqa
just briefly Muhammad (PBUH) promised him that he would one day wear the bangles of Khusrow of Iran, that promise was fulfilled during the caliphate of Umar (the second caliph) muslims defeated the Persians and Suraqa was brought to wear the bangles of Khusrow,
so were Mekkans tolerant ??? I don't think so