As for the incidents you mentioned with Ukrainians shouting about Muscovites, you yourself write that this happened starting in 2014. That is, after the invasion of Russian troops into the Ukrainian peninsula of Crimea, which occurred in February 2014. And accordingly, the Ukrainians had the right to call for the killing of the occupiers.
By the way as regards Crimea it seems to me that you are not aware of the fact that basically Crimea has never been a part of Ukraine. This territory has always been populated by ethnic Russians. Crimea was handed over to Ukraine by Krushov in the 50-ies only due to the fact that it was more convenient for Moscow at that time to keep Crimea in the jurisdiction of Ukraine..
Has the territory of the Crimean peninsula always been inhabited by ethnic Russians? Not true. Let's take a look at who previously lived in Crimea and within which states.
So, from the middle of the 13th century, the steppe Crimea was part of the Golden Horde; after the decline of Byzantium, the southern coast of Crimea was occupied by Genoese colonies. After the collapse of the Golden Horde in the middle of the 15th century, the Crimean Khanate was formed in Crimea. After the Turkish conquest in 1475, the coastal cities and the mountainous part of Crimea became part of the Ottoman Empire. The rest of the peninsula was owned by the Crimean Khanate, which, in turn, became a vassal of the Ottoman Empire. According to the Kuchuk-Kainardzhi Peace Treaty of 1774, signed as a result of the Russian-Turkish War of 1768-1774, both Turkey and Russia pledged not to interfere in the affairs of the Crimean Khanate. In 1783, the Crimean peninsula was conquered and annexed to the Russian Empire, the Tauride region was formed here, and later the Tauride province.
As you can see, it was only at the end of the 18th century that Crimea was conquered by the Russian Empire. And the indigenous people in Crimea are the Crimean Tatars, whom Stalin forcibly deported in May 1944 to Kazakhstan, Uzbekistan, Tajikistan, the Mari Autonomous Soviet Socialist Republic and other regions of the USSR. In total, 238,500 people were deported from Crimea at that time, of which 205.9 thousand, that is, 86.4%, were women and children. In independent Ukraine, the Crimean Tatars were officially recognized as the indigenous people of Crimea and the descendants of the deportees were allowed to return to Crimea.