Anti-christian pogroms, both against Armenians and Greeks are a major thing through the Ottoman empire. At least these (https://en.wikipedia.org/wiki/Hamidian_m

Anti-christian pogroms, both against Armenians and Greeks are a major thing through the Ottoman empire. At least these (https://en.wikipedia.org/wiki/Hamidian_massacres https://en.wikipedia.org/wiki/Hamidian_massacres) are pre-1900. However, there's certainly a more well-established hatred of Christians than a specific hatred of Armenians; and I think the Armenians were first hated because they were Christians, and then later on hated because they were Armenians.