My very best life long friend was a conservative through and through, but he would no more vote for a Republican than Karl Marx would vote for Reagan.
He was from a family of thirteen children and lived in poverty most of his life, with some help from the government, sadly that shaped his political view though his entire life.
I would point to his absolute opposition to Democratic Party Policy, but facts did not change him. I had to give up.
You might point out that whatever assistance he has received came from people like you and me. It came from people who work hard, make the country work, pay taxes and keep the government from going broke.
The Democrats are all parasites. They don’t support anyone. They are takers. I have never met a generous Democrat. They all have their hands out. They all want something for nothing.