What is the interpretation of the feeling of hatred towards those who commit sins and imagining them in the grave, and the intense chest tightness that reaches the point of crying upon seeing people amusing themselves and dancing at weddings?

Hating to commit sin and imagining the sinner in the grave as a reminder of the Reckoning, and feeling sorrow over people's amusement and dancing, are good things. These feelings should lead to compassion for them, praying for their rectitude and guidance, and directing them towards good. One must not exceed the bounds in hatred and sorrow to avoid psychological illness, for a Muslim does not hate completely; rather, they hate in proportion to the person's sin and love in proportion to their obedience.