Mark 7:18 “Are you so dull?” he asked. “Don’t you see that nothing that enters a person from the outside can defile them? 19 For it doesn’t go into their heart but into their stomach, and then out of the body.”
(In saying this, Jesus declared all foods clean.)
It's not about washing hands. Why would you ignore what Jesus said?
Also Peter was Jewish and had a hard time adjusting to the freedom he has as a Christian.
Acts 10:13 Then a voice told him, “Get up, Peter. Kill and eat.”
14 “Surely not, Lord!” Peter replied. “I have never eaten anything impure or unclean.”
15 The voice spoke to him a second time,
“Do not call anything impure that God has made clean.”
This shows the dietary laws were only for Jews, NOT Christians.