Should I send my friend into a bad trip?
Why do you want to send your friend into a bad trip?
I can't tolerate insensitive people around me,  it makes me sad and horny
You have the notion that insensitive people deserve to be sent into a bad trip with drugs, but you are acting like he is your foe. Always show friends a better time, never make them suffer. Friends will not be there for you ever again if you do bad things to them, drugs have a terrible effect on the body.
It doesn't matter if he's my friend, I can bring him down with my drugged popcorn.
Friends shouldn't be giving one another drugs without approval. Nor should they intentionally try to make the other experience a bad trip. Your friend could end up experiencing some terrible events that may traumatize them.