true, Turks should be content that they once held the entire continent of Europe in terror.
Europe - Wikipedia
This definition of Europe's borders gives it an area of 10,180,000 square kilometers or 3,930,000 square miles.
The Ottoman Empire ruled most of the Balkan Peninsular in Europe for centuries, and thus ruled about 466,273.6 square kilometers, or 0.0458 of Europe. It also ruled large parts of Hungary, Slovakia, & Romania in Europe. The Ottomans made the Khanate of Crimea a vassal state in 1475, and the Khanate of Crimea claimed the right to collect tribute from Russia. European Russia looks like about half of all Europe.
The Ottomans first gained territory in Europe in 1355. They defeated Serbian coalitions at the Maritsa in 1371 and at Kosovo in 1389. They conquered most of Bulgaria by 1393, and captured the two rival Bulgarian Emperors in 1395 and 1396. The first of several unsuccessful crusades against the Ottomans was defeated in 1396. The first Ottoman siege of Constantinople lasted from 1930-1402.
From 1438 onward the electors always (except for once) elected a Habsburg ruler in southeastern Germany as emperor, no doubt because the Habsburg territories were the closest to the Ottomans and the most affected by Ottoman raids. Ottoman armies besieged Vienna in 1529 and 1683.
The Ottoman empire spread fear far beyond its borders. The Tatars of the Khanate of Crimea raided Russia, Poland/Lithuania, and other parts of Eastern Europe for slaves for centuries. Tatar slave raids in East Slavic lands - Wikipedia
The Ottoman vassal states in the western Mediterranean sent out Corsairs or Barbary Pirates to raid Christian ships and coastlines for slaves. Many coastlines in the western Mediterranean still have watchtowers and other defenses against Barbary pirates, and many coastal regions were depopulated as people moved inland to escaped the raids. Most European countries had charitable organizations to buy the freedom of (some of) their people enslaved in the Barbary states.
The Barbary pirates didn't limit their raids to the Mediterranean Sea but also attacked ships and coastlines in the Atlantic.
For example, Jan Janszoon von Haarlem (c. 1570-c. 1641), a Dutchman who became the Muslim captain Murat Reis the younger, led the Sack of Baltimore in Ireland in 1631, as well as raids on Iceland in 1627.
Sack of Baltimore - Wikipedia
Turkish Abductions - Wikipedia
It has been estimated that over the centuries a few million Europeans were abducted and enslaved by the Ottoman Turks and their dependents and allies.
So the Ottoman Empire oppressed a significant percentage of Europe for centuries, and for centuries spread the fear of Ottoman conquest far beyond its borders, and for centuries Europeans tens, hundreds, or even thousands of kilometers or miles beyond its borders lived in terror of being enslaved by Ottoman subjects.
So it isn't much of an exaggeration to say that the whole continent of Europe felt terror and hatred toward the Ottoman Empire.