So, in Turkey there are some people who don't like Armenians. This means they have negative feelings towards Armenians and don't treat them very nicely.
This started a long time ago, when Turkey and Armenia were having some problems. Some people in Turkey blamed the Armenians for these problems and started to believe that Armenians were their enemies.
They started saying mean things about Armenians and treating them badly. This is called "anti-Armenian sentiment."
This is not fair or right, because just like how everyone deserves to be treated with kindness and respect, Armenians deserve that too. We should always try to treat everyone kindly and not judge someone just because of where they come from or their beliefs.