The best way to deal with any reaction from a narcissist is to remain firm in your decision to go no contact. Do not engage with them or try to reason with them, as this will only give them more ammunition to use against you.
It is normal to want to have a close and loving relationship with your brothers and sisters, but sometimes this is not possible. If you have a narcissistic sibling, it is important to take steps to protect yourself from their toxic behaviour.
Toxic positivity is when someone excessively focuses on the bright side to the point where they ignore their own negative emotions and the negative emotions of others. It’s a way of thinking that downplays any negativity and encourages people to just “suck it up” or “look on the bright side.”