Some days I wish I had a 'Do Not Disturb' sign that I can wear around my neck.
People don't like it when you tell them to leave you alone.
You can even explain that you're having an off day. Still, they get offended.
Just go away. No need to be upset. I simply don't want to interact with anyone other than my dogs.
The issues with being an introvert. Or maybe being a human. Because don't we all have these days?