Exactly as someone said, class warfare is a cultural problem nowadays. This is because the enemy has corrupted socio-economic classes by severing the link of financial power to understanding and wisdom.
Nowadays, most people in middle and upper classes have the maturity, understanding and wisdom of a peasant, just like most working class people. By this I mean that they're overly concerned with their selfish interests and, at most, their family interests.
That's a basic level of existence. Someone above working class should have overcome that and gradually be serving their community more and more.
Instead, we have millionaires and billionaires operating businesses in their countries (whether harmful, beneficial, or neutral) by offshoring, for example. Offshoring reduces business costs, sure. However, the price for that is harming your community by taking jobs away from your country, reducing the opportunity and damaging the economy. Offshoring should be treated as a full betrayal of one's nation, with heavy sanctions even including seizing of all assets, and exile (or internment in a re-education facility, because it's a net loss for the whole country.
Similarly, you have the same millionaires and billionaires fleeing their country because they can't hire foreigners on minimum wage jobs anymore, or for other stupid and selfish reasons. Another act of betrayal because they're only millionaires and billionaires because the citizen of their country have paid for their services and products.
In the past, people above the working class level contributed massively to the advancement of society, in all areas of society, because they understood the fundamental truth of equal exchange. You receive value and you give back the same value. A smart investment of resources.
Yes, it is not a problem of different classes existing. We're not equal. It's a fully cultural problem generated by the enemy first through feudalism. Communism is cancer as much as capitalism.